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23-07-2021 | Issue 3/2021 Open Access

# Legitimacy of Authority and Protest Actions in Response to Collective Disadvantages

Journal:
Social Justice Research > Issue 3/2021
Authors:
Jérôme Blondé, Vincenzo Iacoviello, Dimitrios Lampropoulos, Matthieu Vétois, Juan Manuel Falomir Pichastor
Important notes

## Supplementary Information

The online version contains supplementary material available at https://​doi.​org/​10.​1007/​s11211-021-00374-z.

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## Introduction

In response to the introduction of restrictive socio-economic policies and unpopular reforms, the number of massive protest movements around the world has risen dramatically in recent years (Ancelovici et al., 2016; Della Porta & Mattoni, 2014). The cases of the Indignados movement in Spain, the Occupy Wall Street movement in the USA or, more recently, the Gilet Jaunes movement in France are examples amid others. Notwithstanding the claims and grievances raised by the protesters are manifold and often disparate, it seems that a shared sense of being disadvantaged by an unequal distribution of wealth among citizens has unanimously fuelled such a surge of political activism. As an illustration, the Declaration of the Occupation of New York City was presented as follows: “ As we gather together in solidarity to express a feeling of mass injustice, we must not lose sight of what brought us together” (Occupy Wall Street, 2011). In parallel, the mutualization of opposition forces and close cooperation between social actors in establishing collective protest movements (e.g. political marches, strikes, petitions) still remains a preferred modus operandi to redress for the disadvantages resulting from an unequal system and restore justice of the social order.
Likewise, research in social psychology has largely acknowledged that the perception that one’s group suffers from structural injustice or disadvantages plays a crucial role in individuals’ support and participation in collective actions (Klandermans, 1997; Wright, 2001; Wright et al., 1990). In the present work, we aimed to expand this research by investigating the effects of collective disadvantages on intention to engage in protest actions as a function of authority legitimacy.

## Collective Disadvantages and Participation in Collective Actions

By the late 1960s, the relative deprivation theory (RTD) posited collective consciousness of being unfairly deprived of benefits or provided with burdens as a prerequisite for individuals’ engagement in protest movements. Collective actions were theorized to build on the perception that one’s group suffer from more disadvantages relative to other similar groups (Runciman, 1966; Smith & Ortiz, 2002). Since then, a myriad of studies has provided convergent support for this view and the importance of perceived injustice in sparking collective actions has been reflected in a great number of social psychological models (Becker & Tausch, 2015; Van Stekelenburg & Klandermans, 2013; Van Zomeren et al., 2008, 2018; Wright, 2010). Perhaps most notably, this is the case with one of the most influential theoretical models to date, the social identity model of collective action (SIMCA; van Zomeren et al., 2004, 2008), which elevates perceived injustice as one of the few key precursors of collective actions. Along with group efficacy (i.e. the extent to which protest actions are viewed to be effective for redress of grievances) and identification (i.e. the extent to which protest group has a particular subjective importance), this model proposes that individuals take part in collective actions to the extent that their group is perceived to deal with blatant inequalities. Similarly, in their review of the collective action literature, Becker and Tausch ( 2015) illuminated the pivotal role of injustice appraisals, in addition to efficacy appraisals, in fuelling motivation to engage in a protest movement. Accordingly, perceived group disadvantages lie at the very heart of the concerns leading individuals to participate in collective actions.
Research surrounding the RDT has highlighted that group-based injustice encompasses cognitive and affective components, which both play a role in mobilizing people into collective actions (see Walker & Smith, 2002). Perceived disadvantage constitutes the cognitive dimension of injustice, whereas group-based emotions, such as anger or resent, form the affective dimension. Against this backdrop, a wide range of studies have shown that perceived group disadvantages propel participation in collective actions through anger (e.g. Becker & Tausch, 2015; Leach et al., 2007; Thomas et al., 2009; Van Zomeren et al, 2004, 2008; Yzerbyt et al., 2003). Based on the intergroup emotion theory (Mackie et al., 2000), the perception of being treated unfairly has been theorized as eliciting emotional reactions of anger, which in turn trigger action tendencies to resist and oppose those responsible for the wrongs committed.
However, despite a high sense of disadvantage, individuals may not necessarily invest much effort into initiating or taking part in collective actions. It has been shown that socio-economic inequalities and structural status-based differences between social groups may be well accepted by those most negatively affected and may provoke relatively little opposition (Becker et al., 2017; Jost et al., 2012, 2017). In the same vein, the present research focused on the role of group authorities and aimed to show that the perceived legitimacy of authority figures is capable of mitigating the readiness to participate in protest movements in response to an unfair treatment. 1

## Legitimacy of Authority Figures and Compliance

Legitimacy of authority may be defined as the perception that authority figures, such as CEOs, managers, or group leaders, are appropriately entitled to exercise their power and status within a given community (Tyler, 2006a). An authority derives its legitimacy, in part, from alignment with social norms, values, or practices that are commonly shared within the group (Zelditch, 2001), or from respect with the rules of procedural justice, such as neutrality or representativeness (e.g. Sunshine & Tyler, 2003; Tyler & Lind, 1992; Tyler, 2006a, 2010).
Perception of legitimacy is vital for the group functioning and has profound consequences for cooperation between group members and authority (Tyler, 1997, 2006a). As a fundamental collective belief (Johnson et al., 2006), legitimacy establishes an implicit social contract giving authority the right to impose decisions and obliging subordinates to comply with them, regardless of punishments or rewards that they may receive (Zelditch & Walker, 2003). In this sense, legitimacy creates a sense of obligation and deference to authority and justifies group members’ consent to its decisions (Tyler, 2006b).
A wide array of work has shown that individuals tend to be more compliant with decisions made by authorities that are perceived legitimate (e.g. Hegtvedt & Johnson, 2009; Levi et al., 2009; Tyler & Huo, 2002; Tyler, 2006a). For example, cooperation with legal authorities, acceptance of judicial sentences, obedience to the law, and compliance with tax payments have been found to be stronger to the extent that they are viewed as legitimate (e.g. Jackson et al., 2012; Murphy et al., 2009; Tyler, 2006b). Similar perspectives can also be drawn from research on obedience to authority showing that individuals are more willing to obey authorities to whom they attribute strong legitimacy, such as the scientists (Kelman & Hamilton, 1989; Milgram, 1974).
Moreover, legitimacy has been found to mitigate negative emotional reactions to experiencing unfair situations, such as anger, but also frustration or resentment, which in turn reduce the propensity to cooperate with the authority (Johnson et al., 2000, 2016; Tyler & Huo, 2002). Legitimacy acts as a brake on affective-based motivational forces stimulated by injustice and attenuates their corresponding behavioural tendencies (i.e. resistance and opposition). According to Johnson et al. ( 2016), because they create uncertainty about one’s own feelings and reinforce the fear of sanctions and ostracism, legitimacy processes act as control mechanisms by regulating the intensity of emotional responses to an unfair distribution of outcomes.
Although the effects of legitimacy have been widely documented in past research, only limited attention has been given as to whether legitimate figures of authority can equally alter individuals’ participation in collective actions. Yet, while legitimacy may decrease feelings of anger and increase acceptance of detrimental decisions, it is reasonable to assume that intention to participate in collective actions could be reduced as well. In the face of unfavourable decisions resulting from a legitimate authority, it is plausible that people will be less prompt to actively take action. Accordingly, the purpose of this study was to expand the research on legitimacy of authority by examining whether legitimate authorities can reduce engagement in protest actions in response to collective disadvantages, notably through a reduction in anger.

## Legitimacy of Authority Figures and Violation of Moral Values

In this research, we argued that legitimacy has the potential to restrict individuals’ readiness to protest, but only when perceived disadvantages are relatively low. In contrast, we hypothesized that the legitimacy effects would be undermined when the sense of collective disadvantage reaches high levels. First, this is because a strong disadvantage would generate intense feelings of group-based anger that legitimacy could not mitigate. Second, when a decision is extremely disadvantageous, strong moral concerns would arise and freeze the capacity of legitimacy to mitigate anger and, in turn, engagement in collective actions.
Research has indeed shown that violation of moral beliefs can provoke very intense reactions, such as violent and deviant behaviours (Mullen & Nadler, 2008). In addition, when rules or decisions are at odds with moral values, procedural justice and legitimacy have been shown to be discounted as relevant factors in judgment and cannot have a mitigating effect on compliance with authorities (Skitka, 2002; Skitka et al., 2009; Skitka & Mullen, 2002; for a discussion, see Skitka & Morgan, 2014). Legitimacy can protect against deleterious effects caused by an adverse decision to the extent moral standards are not significantly challenged. When moral convictions are at stake (as is the case, for example, in a situation of great injustice), individuals’ principles of judgment are based on the sole moral value that they confer on the decision taken (i.e. Is it morally “right” or “wrong”?) and refrain from deferring to authorities, regardless of how legitimate they are. For example, Skitka et al. ( 2009) investigated people’s reactions to court decisions involving intense moral values (e.g. legalization of physician-assisted suicide). They observed that moral beliefs are the main predictors of people’s acceptance of decisions made by judges and not their legitimacy. Regardless of judicial authorities’ perceived legitimacy, those who were morally opposed estimated the final decision to be less fair and expressed more rejection. To echo the argument developed above, an unfair situation might reveal to be at odds with individuals’ moral stances and, as such, could dispel uncertainty on which the potential of legitimacy for action is drawn. Moral resonance relating to disadvantages signals that the situation is unambiguously irregular, thereby providing justification for actively engaging in resistance movements.
Studies have also shown that emotions arising from the violation of moral values would be too intense to be mitigated by authority legitimacy or fair procedures (e.g. Mullen & Nadler, 2008; Mullen & Skitka, 2006). Breaches with important moral values have been shown to trigger strong emotional reactions, such as moral outrage or anger (Molho et al., 2017; Tetlock et al., 2000; Van Zomeren & Lodewijkx, 2005), which are automatic responses, often difficult to control (Haidt et al., 1993). This, in turn, guides justice judgments and strongly motivates to act in ways that maintain and preserve one’s sense of morality (Skitka, 2002; Skitka et al., 2008). In other words, given that moral values are higher-order principles and meaningful stances, any transgression poses an acute threat, alerting individuals, through heightened emotions, that strong disadvantages are occurring and that appropriate responses are needed to remedy them (see Folger & Cropanzano, 1998). In this case, the legitimacy of authority becomes of little use in reducing such emotional reactions and, consequently, protest reactions.
As a result, we contended that the level of perceived disadvantages could condition the effects of authority legitimacy on participation in collective actions. In particular, we expected that a legitimate authority would reduce willingness to engage in protest actions as a response to unfair decisions only when these decisions are weakly unfair, but not when they are strongly unfair. When individuals are subjected to very unfair decisions that would profoundly challenge their moral values, intense emotional reactions will overshadow the effect of legitimacy. Therefore, in the present research, we hypothesized an interaction between perceived disadvantage and legitimacy, so that legitimacy would only affect collective action intentions when disadvantage is relatively low. Under these conditions, because the authority’s decisions are less likely to conflict with moral values, we predicted that violation of moral values should be lower, which would temper anger and, in turn, would reduce collective action tendencies. 2 Conversely, a condition of strong disadvantage would fail to trigger such mitigation. In other words, perceived disadvantages would moderate the effects of authority legitimacy on intention to participate in collective actions, through the serial mediation of moral value violation and anger.
It is important to underscore that the present research’s expectations are in line with a great deal of research that has recently been placed on moral issues in the study of collective actions (see Van Zomeren et al., 2018). This research indicates notably that engagement in collective actions can be boosted when individuals moralize perceived disadvantages, that is, when perceived disadvantages derive from a violation of individuals’ moral values or convictions (Kutlaca et al., 2019; Mazzoni et al., 2015; Van Zomeren & Lodewijkx, 2005; Van Zomeren et al., 2011, 2012). For example, Mazzoni et al. ( 2015) conducted two survey studies with Italian activists and Italian citizens from general public in the context of the Italian Water Movement (i.e. which was a social movement protesting against the liberalization of water resources in Italy). They examined whether and how support for the movement may be linked to participants’ moral values (i.e. notably, in this context, the fundamental right to water). They consistently found that activism was fuelled by the perception that one’s moral values in terms of free access to water have been harmed. In addition, this relationship was mediated by identification to the movement. According to the authors’ reasoning, support for collective actions is shaped by the extent to which perceived moral violation caused by disadvantage fits with a protest group identity. People are more likely to engage in a movement or politicized group whose identity and central social norms resonate with their own moral values and are directed at redressing moral violation (Van Zomeren et al., 2012). Our research will add to this research in studying the still under-examined relationship between perceived disadvantages and moral values on collective actions, while considering the moderating role of authority legitimacy, which in itself has been found to be highly associated with morality.
Beyond this, the present work sought to provide innovative and solid contributions to research. First, we intended to show that authority legitimacy plays a significant role in engagement in collective actions and that it should be distinguished from perceived injustice. Although both are closely related (see Hegtvedt et al., 2016), justice and legitimacy are conceptually distinct constructs. Justice, and notably distributive justice, refers to the perception that an allocation of resources from an authority does not benefit more other groups than one’s group. Legitimacy corresponds to the perception that one person is entitled to exercise a position of power and authority over subordinates. In this sense, justice pertains to the actions enacted by an authority towards individuals, while legitimacy, more broadly, pertains to the person itself and appropriateness of his or her social position within a group. Accordingly, authority legitimacy differs conceptually from perceived injustice and cannot be considered as a mere dimension feeding justice perceptions. 3 Besides, individuals can establish perceptions of justice quite independently of how they construct perceptions of legitimacy (Caldeira & Gibson, 1992; Gibson, 1989). Research has shown that group authorities may be perceived high in legitimacy even if they allocate outcomes unfairly, notably because group members tend to attribute authority’s unfair actions to external causes and to disclaim any responsibility for its wrongs (Hegtvedt et al., 2003; Hegdvedt & Johnson, 2000). Therefore, it is fundamental to differentiate legitimacy from perceived injustice in our understanding of engagement in collective actions.
Second, as a corollary, another important contribution of our research is to examine for the first time how authority legitimacy may mitigate the impact of perceived disadvantage on collective actions. Despite that research has repeatedly shown that both strongly interact in their effects on cooperation with authority figures (e.g. Hegtvedt et al., 2016; Walker, 2014; Walker et al., 1986; Zelditch & Walker, 1984), the interaction between disadvantage and legitimacy on collective actions has never been addressed. Therefore, it is of great interest to analyse legitimacy independently from injustice and to examine how legitimacy and injustice perceptions both together affect collective actions and how they can allow to reconsider the well-established effect of perceived group disadvantage.

## The Present Research

The current research sought to examine the role of authority legitimacy in the effects of collective disadvantages on intention to participate in protest actions. We conducted three studies using fictitious vignettes to manipulate authority legitimacy. In Study 1, we manipulated authority legitimacy with three levels (i.e. high, moderate, and low), 4 while perceived disadvantage was held constant at a medium level. More specifically, we tested the following hypothesis:
H1
We expected that the more an authority is perceived as legitimate, the less people would intend to engage in protest actions in response to collective disadvantages.
In Studies 2 and 3, we manipulated both legitimacy and disadvantage (i.e. low vs. high + one condition with no-explicit disadvantage in Study 3) and examined the following hypothesis:
H2
We expected authority legitimacy to reduce collective action intentions only when disadvantage is low.
In all studies, we further examined the mechanism underlying the effects predicted in H1 and H2. In Studies 1 and 2, we looked at the mediating role of anger, while study 3 tested a moderated serial mediation model including violation of moral values and anger. The following hypotheses were tested:
H3
We expected anger to mediate the effect of authority legitimacy on collective action intentions.
H4
We expected anger to mediate the effect of authority legitimacy on collective action intentions only when disadvantage is low.
H5
We expected the effect of authority legitimacy on collective action intentions to be mediated by violation of moral values and then anger, but only when disadvantage is low.

## Study 1

### Method

#### Participants and Procedure

We determined the required sample size for this study by performing an a priori power analysis with G*Power v.3.1 (Faul et al., 2007), testing for a main effect with three independent groups. Based on a medium estimated effect size of f = 0.25 and a desired statistical power of 0.80 (0.05 alpha level), it was established that we needed a minimum of 128 participants for the predicted main effect. Thus, 140 French undergraduate students were recruited and voluntarily took part in this study ( M Age = 20.21, SD Age = 2.16; women: N = 81). They were randomly assigned to one of three experimental conditions (legitimacy: low vs. moderate vs. high). After consenting to the study, participants were instructed to read a fictitious vignette and imagine themselves as if they were working in a small company. They were told that a new manager was recently hired in this company by an independent recruitment firm. Upon his arrival, he announced that he intended to reorganize the way things work at the company in order to improve its productivity, which would require from employees to work extra hours for the same wage (i.e. which corresponds to the group disadvantage). The vignette then indicated that, after the meeting, some people showed their discontent and planned on taking action to oppose such a decision. Right after this, participants wrote down their thoughts about the vignette. They then completed measures of anger and collective action intention. Finally, they reported sociodemographics (i.e. sex and age) before being debriefed and thanked for their participation.

#### Independent Variable

Authority legitimacy was manipulated in the vignette by varying information about how the company’s new boss was appointed. In the condition of high legitimacy, participants were informed that he was hired very impartially by the recruitment firm and that he met all the required qualifications to be the leader of the company. In the condition of moderate legitimacy, we also informed participants that the new boss’ educational background was very well suited to the position. However, we added that he might have benefited from the help of someone he knew from the recruitment firm who got him the job by “pulling some strings”. In the condition of low legitimacy, we outlined that the new boss was not appropriately qualified for the position and that he might have received support from someone in the recruitment firm.
Legitimacy was manipulated in a way to make it distinct from the disadvantage. Indeed, both concepts being relatively close, it may be easy to manipulate one while affecting the other. This is why we manipulated legitimacy by varying how someone is designated as the group authority (for a close procedure, see Hays & Goldstein, 2015). In contrast, disadvantage here refers to the authority’s actions towards group members (through the distribution of outcomes such as work time and salaries). By employing such a “distal” manipulation of legitimacy that disentangles the designation of the authority from its actions, we ensured that legitimacy does not intertwine with the effects of disadvantage and matches well with its definition.
A pilot study was carried out to verify whether this manipulation can elicit expected levels of legitimacy. Thirty-eight undergraduate students had to read one of three scenarios and then to report, on 7-point rating scales ranging from 1 (=  not at all) to 7 (=  yes absolutely), whether they believe that it is “legitimate” and “fair” that the new boss holds his or her position ( r = 0.79, p < 0.001). Results gave evidence for a linear relationship between the experimental conditions and perceived legitimacy, β = 0.82, SE = 0.21, t = 9.004, p < 0.001, 95% CI = [1.483, 2.346]. The new boss was rated to be more legitimate in the condition of high legitimacy ( M = 5.96, SD = 1.12) than in the condition of moderate legitimacy ( M = 4.80, SD = 1.16), and even more than in the condition of low legitimacy ( M = 2.13, SD = 1.09).

#### Measures

First, we measured anger with two items (i.e. participants had to report whether, in the situation detailed in the vignette, they would have felt “angry” and “furious” after the new boss has announced his decision; r = 0.80, p < 0.001). Second, intention to participate in collective actions was assessed with two items asking participants “whether they approve the protesters’ actions” and “whether they would like to participate in the protesters’ actions”. 5 For ecological validity reasons, we gave examples of actions, such as “signing petitions” or “going on strike”. Both items were averaged ( r = 0.68, p < 0.001). Both measures were accompanied with response scales ranging from 1 (= not at all) to 7 (= yes absolutely).

### Results

To test H1 and H3, we created two orthogonal contrasts, namely C1, as the planned contrast (conditions were coded as follows: low legitimacy = −1, moderate legitimacy = 0, high legitimacy =  + 1), 6 and C2, as the residual. (Conditions were coded as follows: low legitimacy =  + 1, moderate legitimacy = −2, high legitimacy =  + 1.) To conclude for the linear effect of legitimacy, C1 must be significant, while C2 should not (see Abelson & Prentice, 1997).

#### Manipulation Check

To check for our manipulation, we asked participants to complete the same measure as the one used in the pilot study ( r = 0.80, p < 0.001). Results showed that C1 was significant, β = 0.77, SE = 0.13, t = 14.46, p < 0.001, 95% CI = [1.620, 2.133], $$\eta_p^2$$ = 0.60, while C2 was not, β = 0.10, p = 0.066. Thus, as we expected, the new boss was judged to be more legitimate in the condition of high legitimacy ( M = 6.01, SD = 1.09) than in the condition of moderate legitimacy ( M = 4.55, SD = 1.37), and more legitimate in the condition of moderate legitimacy than in the condition of low legitimacy ( M = 2.26, SD = 1.19).

#### Anger

Analyses showed that C1 was significant, β = −0.40, SE = 0.17, t = −5.03, p < 0.001, 95% CI = [−1.190, −0.518], $$\eta_p^2$$ = 0.16, while C2 was not, β = −0.10, p = 0.231. This indicates that participants felt less anger in the high legitimacy condition ( M = 2.85, SD = 1.48) than in the moderate legitimacy condition ( M = 4.05, SD = 1.73) and than in the low legitimacy condition ( M = 4.56, SD = 1.58).

#### Collective Action Intentions

We found a significant effect of C1, β = −0.27, SE = 0.18, t = −3.31, p = 0.001, 95% CI = [−0.926, −0.233], $$\eta_p^2$$ = 0.07, but not of C2, β = 0.10, p = 0.222. Intention to take part in collective actions was the lowest when legitimacy was high ( M = 4.23, SD = 1.83) and the highest when legitimacy was low ( M = 5.39, SD = 1.58). The moderate condition fell in between ( M = 4.45, SD = 1.60; see Fig.  1).

#### Mediation Analyses

To test whether anger mediated the effect of legitimacy on intention to engage in collective actions, we run a mediation analysis by using the PROCESS macro (Model 4; Hayes, 2013) with 5000 bootstrap re-samples. We entered C1 as the predictor, anger as the mediator, intention to engage in collective actions as the predicted variables, and C2 as a covariate. In line with H3, we found a significant indirect effect, B = −0.38, SE = 0.10, 95% CI = [−0.582, −0.210] (see Fig.  2).

### Discussion

Consistent with H1 and H3, the present results showed that, in the face of disadvantageous decisions, increased authority legitimacy reduced willingness to participate in collective actions. Moreover, anger mediated this effect.

## Study 2

While Study 1 held the level of disadvantage constant, the purpose of Study 2 was to manipulate it and compare the effect of legitimacy on intention to participate in collective actions when disadvantage is low or high. In line with H2, we predicted that an authority with high legitimacy can attenuate collective action motivation only when disadvantage is low. In contrast, when disadvantage is high, legitimacy could no longer have an impact on individuals’ motivation to take action. In addition, we were also interested in examining whether the intensity of disadvantage could affect the mediation by anger (see H4). To the extent that high disadvantage instigates high levels of anger, regardless of legitimacy, anger could not be reduced and therefore should not play a mediating role between legitimacy and collective action intention. Procedure and experimental materials of Study 2 are similar to Study 1, the only difference being the manipulation of disadvantage.

### Method

#### Participants and Procedure

Reporting the same effect size as in Study 1 ( f = 0.25) and a desired statistical power of 0.80, we again performed an a priori power analysis with G*Power, testing, this time, an interaction effect, with six groups in total. This indicated that we needed a minimum of 155 participants. We recruited a total of 228 French undergraduate students who voluntarily participated in this study ( M Age = 19.42, SD Age = 1.72; women: N = 186). They were randomly allocated to one of six experimental conditions of a 3 (legitimacy: high vs. moderate vs. low) × 2 (disadvantage: low vs. high) between-subject factorial design. Similar to Study 1, participants were instructed to read the same vignette (including the additional manipulation of disadvantage) before completing the measures of anger and collective action intention. Finally, they were asked for their sex and age and were debriefed and thanked for their participation.

#### Independent Variables

We used the same manipulation of legitimacy as in Study 1. To manipulate the level of disadvantage, we provided participants with some information about the authority’s decisions on changing the way things work in the workplace. In the condition of low disadvantage, participants read that the changes included longer working time but, as a compensation, a significant increase in the employees’ salary. In contrast, in the condition of high disadvantage, participants were told that in addition to longer working time, there will be significant cuts in their salary. It is important to note that the low disadvantage condition, which might appear as being quite advantageous because a financial compensation is offered, still remains disadvantageous because people are requested to work more than they used to do before. One may easily assume that the increase in salary could not fully compensate for the inconveniences caused by such an increase in working time. Besides, not all individuals want to earn more money in their work, some just do not want to work more.

#### Measures

We measured anger and intention to participate in collective actions with the same items as in Study 1. Reliability of these measures proved to be satisfactory (anger: r = 0.83, p < 0.001; intention: r = 0.72, p < 0.001).

### Results

Hypotheses were tested by computing the same contrasts as in Study 1. We performed multiple regression analyses with C1, C2, disadvantage (coded as follows:—1 = low, 1 = high), and the two interaction products between disadvantage and each contrast. We concluded on significance of the interaction between the two independent variables with the conditions of legitimacy varying with each other when the product including C1 was significant, while the product including C2 was not.

#### Manipulation Checks

Using the same items as in Study 1 to check for the manipulation of legitimacy ( r = 0.83, p < 0.001), analyses showed a significant effect of C1, β = 0.79, SE = 0.10, t = 19.47, p < 0.001, 95% CI = [1.735, 2.126], $$\eta_p^2$$ = 0.62, and a significant (though weaker) effect of C2, β = 0.09, SE = 0.06, t = 2.18, p = 0.030, 95% CI = [0.012, 0.236], $$\eta_p^2$$ = 0.02. The new boss was evaluated as more legitimate in the condition of high legitimacy ( M = 6.04, SD = 1.07) than in the condition of moderate legitimacy ( M = 4.48, SD = 1.37), and more legitimate in the condition of moderate legitimacy than in the condition of low legitimacy ( M = 2.18, SD = 2.00). The disadvantage variable was checked through one single item, which asked participants to report, on a 7-point rating scale, whether “they think that the new organization of work was fair”. Supporting the efficacy of our manipulation, participants evaluated the new organization of work to be less fair in the condition of high disadvantage ( M = 3.18, SD = 1.88) than in the condition of low disadvantage ( M = 4.84, SD = 1.83), t(229) = 6.82, p < 0.001, 95% CI = [1.182, 2.143].

#### Anger

Analyses revealed a main effect of C1, β = −0.20, SE = 0.12, t = −3.63, p < 0.001, 95% CI = [−0.696, −0.207], $$\eta_p^2$$ = 0.06, but not of C2, β = 0.08, p = 0.135. We also found a main effect of disadvantage, β = 0.49, SE = 0.10, t = 8.84, p < 0.001, 95% CI = [0.694, 1.092], $$\eta_p^2$$ = 0.26. More importantly, we found the expected interaction between C1 and disadvantage, β = −0.15, SE = 0.12, t = −2.60, p = 0.010, 95% CI = [−0.567, −0.078], $$\eta_p^2$$ = 0.03, while the interaction with C2 was not significant, β = 0.02, p = 0.773. Decomposition of this interaction showed that C1 was non-significant in the condition of high disadvantage, β = −0.06, p = 0.456, but was significant in the condition of low disadvantage β = −0.35, SE = 0.18, t = −4.34, p < 0.001, 95% CI = [−1.125, −0.422], $$\eta_p^2$$ = 0.08, thus indicating that anger was lower when legitimacy was high ( M = 2.20, SD = 1.15) than moderate ( M = 2.59, SD = 1.52) and than low ( M = 3.75, SD = 1.35). C2 was not significant in both conditions of disadvantage ( ps > 0.20).

#### Collective Action Intentions

We found a significant main effect of C1, β = −0.21, SE = 0.12, t = −3.39, p = 0.001, 95% CI = [−0.665, −0.177], $$\eta_p^2$$ = 0.05, while C2 was non-significant, β = 0.05, p = 0.459. Moreover, we found a main effect of disadvantage, β = 0.36, SE = 0.10, t = 5.96, p < 0.001, 95% CI = [0.402, 0.800], $$\eta_p^2$$ = 0.14. Consistent with H2, results also showed that the interaction between C1 and disadvantage was significant, β = −0.13, SE = 0.12, t = −2.22, p = 0.028, 95% CI = [−0.519, −0.031], $$\eta_p^2$$ = 0.02, while the interaction with C2 was not, β = 0.02, p = 0.741. Decompositions indicated that C1 was not significant in the condition of high disadvantage, β = −0.07, p = 0.398, but was significant when disadvantage was low, β = −0.34, SE = 0.18, t = −3.90, p < 0.001, 95% CI = [−1.047, −0.345], $$\eta_p^2$$ = 0.06. In this condition, collective action intentions decreased as authority legitimacy increased, with the high legitimacy condition ( M = 3.61, SD = 1.61) being lower than the low legitimacy condition ( M = 5.00, SD = 1.49), and the moderate legitimacy condition in between ( M = 4.22, SD = 1.59; see Fig.  3). Note that C2 was not significant in both conditions of disadvantage ( ps > 0.40).

#### Moderated Mediation Analyses

Finally, we examined whether group disadvantage moderated the mediation of anger in the relationship between legitimacy and collective action intention. To do so, we performed moderated mediation analyses by using the PROCESS Model 8 with 5000 bootstrap re-samples. C1 was entered into the analyses as the predictor, anger as the mediator, collective action intentions as the predicted variables, disadvantage as the moderator, and C2 and the C2 * legitimacy interaction as covariates. This analysis showed that the index of moderated mediation was significant, B = −0.34, SE = 0.13, 95% CI = [−0.603, −0.085]. More specifically, we observed that anger mediated the relationship between legitimacy and collective action intentions in the condition of low disadvantage, B = −0.40, SE = 0.09, 95% CI = [−0.591, −0.230], but not in the condition of high disadvantage, B = −0.07, SE = 0.10, 95% CI = [−0.276, 0.125]. This analysis is plotted in Fig.  4.

### Discussion

Consistent with H2 and H4, the present study evidenced that legitimacy reduced collective action intentions in response to low disadvantages. However, when participants faced high disadvantages, our findings revealed that legitimacy was not influential on neither anger nor willingness to participate in collective actions. Relatedly, moderated mediation analyses provided evidence that the mediation of anger only occurred when disadvantage was low.

## Study 3

Study 3 was an attempt to replicate and extent the Study 2’s findings by further examining the mechanisms underlying the interplay of legitimacy and disadvantage on collective action intentions. While previous studies addressed anger as a mediator, the current study focused on both anger and violation of moral values. In line with H5, we predicted that legitimacy and disadvantage may interactively relate to collective action intentions not only through anger but also through violation of moral values. More specifically, we predicted that authority legitimacy should mitigate motivation to engage in collective actions by first reducing perception of violation of moral values and then anger, but only when disadvantage is low. However, when disadvantage is high, legitimacy should no longer predict collective action intentions, precisely because violation of moral values and anger cannot be alleviated. Thus, a model of moderated serial mediation was analysed to test such predictions.

### Method

#### Participants and Procedure

Given that an identical experimental design as in the previous study was tested here again, sample size determination remained also the same. We approached a total sample of 302 participants by using the recruitment website Prolific with a monetary compensation of 1£ ( M Age = 37.24, SD Age = 10.48; women: n = 177). Most of them were British ( n = 287), and all the participants’ country of residence was the UK. All were working in a company when they completed the study: 32.8% reported being administrative personnel, 17.9% business managers, 15.6% technicians, and 10.6% higher executives or major professionals. On average, they had been working for 6.70 years ( SD = 6.01), and 80.3% had a full-time job. They were randomly allocated to one of the six experimental conditions of a 2 (legitimacy: low vs. high) × 3 (disadvantages: low vs. high vs. no-explicit disadvantage) between-subject factorial design. The procedure was similar to the previous studies.

### Measures 7

Unless otherwise specified, all responses to the following measures were given on 7-point rating scales ranging from 1 (= not at all) to 7 (= yes absolutely).

#### Anger

We assessed anger with five items. Participants had to report whether they felt “angry”, “furious”, “irritated”, “outraged”, and “indignant” in reaction to the new boss’ decision ( α = 0.96; M = 3.71, SD = 1.75). 8

#### Violation of Moral Values

Perceived violation of moral values was measured with three items: “The decision made by the new company's boss has clearly violated my moral values”, “I think that the decision made by the new company's boss is immoral”, “The decision made by the new company's boss conflicts with the moral beliefs that are important to me” ( α = 0.92; M = 3.60, SD = 1.79).

#### Collective Action Intentions

Differently from previous studies, we assessed intention to participate in a collective action with five items asking participants whether they would be willing to help the protesters “organize and take part in a strike”, “create and distribute a petition”, “organize and participate in a demonstration”, “distribute flyers”, and “organize information sharing and discussion sessions” (see Teixeira et al., 2020, for a similar measure; α = 0.94; M = 3.08, SD = 1.70).

### Results

We tested our hypotheses by computing two contrasts: C1, as the planned contrast (with conditions of disadvantage coded as follows: no-explicit disadvantage = −1, low = −1, high =  + 2), and C2, as the residual (with conditions coded as follows: low = −1, no-explicit disadvantage =  + 1, high = 0). We then performed multiple regression analyses with C1, C2, legitimacy (coded as follows:—1 = low, + 1 = high), and the two interaction products between legitimacy and each contrast.

#### Manipulation Checks

As a check for the legitimacy manipulation, we used the same items as in Studies 1 and 2 ( r = 0.95, p < 0.001). As expected, participants rated the new boss to be more legitimate in the condition of high legitimacy ( M = 5.55, SD = 1.68) than in the condition of low legitimacy ( M = 2.10, SD = 1.15), t(300) = 20.71, p < 0.001, 95% CI = [3.116, 3.770]. Regarding the manipulation of disadvantage, which was measured with the same single item as in Study 2, we found a significant effect of C1, β = 0.52, SE = 0.06, t = 10.63, p < 0.001, 95% CI = [0.524, 0.762], and a non-significant effect of C2, β = −0.09, p = 0.074. The new boss’ decision was evaluated as less fair in the condition of high disadvantage ( M = 2.36, SD = 1.25) than in the conditions of low ( M = 4.10, SD = 1.53) and no-explicit disadvantage ( M = 4.47, SD = 1.66).

#### Anger

On anger, we found a main effect of legitimacy, β = −0.28, SE = 0.08, t = −6.27, p < 0.001, 95% CI = [−0.643, −0.336], $$\eta_p^2$$ = 0.12. Moreover, we found a significant interaction between legitimacy and C1, β = −0.17, SE = 0.06, t = −3.86, p < 0.001, 95% CI = [−0.104, −0.321], $$\eta_p^2$$ = 0.05, while the interaction with C2 was non-significant, β = 0.03, p = 0.536. Decomposition analyses for this significant interaction showed that legitimacy had a significant effect on anger in the conditions of low (LD) and no-explicit disadvantage (NED), β = −0.40, SE = 0.10, t = −7.24, p < 0.001, 95% CI = [−0.888, −0.508], $$\eta_p^2$$ = 0.15, such that participants reported being less angry when legitimacy was high ( M LD = 2.65, SE LD = 0.19; M NED = 2.05, SE NED = 0.19, respectively) rather than low ( M LD = 3.94, SE LD = 0.19; M NED = 3.57, SE NED = 0.19, respectively). However, the effect of legitimacy was not significant in the condition of high disadvantage, β = 0.04, p = 0.640.

#### Violation of Moral Values

Legitimacy was found to produce a main effect, β = −0.24, SE = 0.08, t = −5.06, p < 0.001, 95% CI = [−0.592, −0.260], $$\eta_p^2$$ = 0.08. The interaction between C1 and legitimacy was also found to be significant, β = −0.20, SE = 0.06, t = −4.15, p < 0.001, 95% CI = [−0.364, −0.130], $$\eta_p^2$$ = 0.06, while the interaction with C2 was not, β = 0.08, p = 0.078. Decomposition of the significant interaction showed that legitimacy predicted violation in both the no-explicit and low disadvantage conditions, β = −0.37, SE = 0.11, t = −6.31, p < 0.001, 95% CI = [−0.872, −0.458], $$\eta_p^2$$ = 0.12, so that participants perceived that their moral values are less violated when legitimacy was high ( M LD = 2.86, SE LD = 0.20; M NED = 1.79, SE NED = 0.21, respectively), rather than low ( M LD = 3.84, SE LD = 0.21; M NED = 3.50, SE NED = 0.21, respectively). However, the effect of legitimacy was not significant in the condition of high disadvantage, β = 0.04, p = 0.647.

#### Collective Action Intentions

Legitimacy had a significant main effect, β = −0.12, SE = 0.08, t = −2.45, p = 0.015, 95% CI = [−0.366, −0.040], $$\eta_p^2$$ = 0.02. As predicted, we also found a significant C1 * legitimacy interaction, β = −0.16, SE = 0.06, t = −3.32, p = 0.001, 95% CI = [−0.310, −0.079], $$\eta_p^2$$ = 0.04, while the C2 * legitimacy interaction was not significant, β = 0.07, p = 0.164 (see Fig.  5). Decomposing this significant interaction showed that legitimacy predicted collective action intentions in the low and no-explicit disadvantage conditions, β = −0.23, SE = 0.10, t = −3.82, p < 0.001, 95% CI = [−0.593, −0.190], $$\eta_p^2$$ = 0.05. High legitimacy produced lower intentions to engage in collective actions ( M LD = 2.47, SE LD = 0.20; M NED = 1.72, SE NED = 0.21, respectively) than did low legitimacy ( M LD = 2.98, SE LD = 0.20; M NED = 2.80, SE NED = 0.20, respectively). However, the effect of legitimacy was not significant in the condition of high disadvantage, β = 0.11, p = 0.200.

#### Moderated Serial Mediation Analyses

As a test for the predicted moderated serial mediation, we used the model 85 of the PROCESS macro. Legitimacy was entered as the independent variable (X), C1 as a moderator (W), and collective action intentions as the main outcome (Y). The mediators were successively perceived violation of moral values (M 1), and anger (M 2). C2 and the interaction product between C2 and legitimacy were included as covariates. The overall index of moderated mediation revealed to be significant, B = −0.07, SE = 0.03, 95% CI = [−0.151, −0.015]. Moreover, we found that the path going from legitimacy to collective action intentions through first violation of moral values and then anger is significant only in the combined conditions of no-explicit and low disadvantage, B = −0.06, SE = 0.03, 95% CI = [−0.123, −0.016], and not in the condition of high disadvantage, B = 0.007, SE = 0.02, 95% CI = [−0.022, 0.043] (see Fig.  6).

### Discussion

Based on a sample of working participants, this study corroborated findings of Study 2. Consistent with H2, we found that high (vs. low) legitimacy reduced intention to take part in a collective action when group disadvantage was relatively low, but not when people faced high disadvantage. Also, the fact that both the conditions of no-explicit and low disadvantage showed similar tendencies suggests that the effect of legitimacy can occur as long as disadvantages are not high. Moreover, the present findings revealed that moral issues account for the interaction between legitimacy and disadvantage on collective action intentions. Consistent with H5, we found that low levels of disadvantage allow for legitimacy to reduce individuals’ desire to engage in a collective action, because it first reduced the overall perception that moral values are transgressed, which subsequently attenuated anger. In contrast, high levels of disadvantage disrupted the effects of legitimacy, mostly because perception of moral violation and feeling of anger could not be reduced, which propelled a strong motivation for collective actions, regardless of the level of legitimacy.

## General Discussion

Taken as a whole, the results observed in the present studies provided convergent support for our main hypothesis (H1) according to which intention to engage in collective actions to redress group disadvantage is likely to be reduced when in-group authority is perceived to be legitimate. Consistent with H2, we also found that the level of disadvantage plays a crucial role, given that the effect of authority legitimacy appeared under low or moderate levels of disadvantage (or even when disadvantage was not made explicit) but not when the authority’s decisions were highly disadvantageous to group members. In an effort to understand the psychosocial dynamics underlying these results, mediation and moderated mediation analyses showed that legitimate authorities decreased the willingness to engage in protest actions because legitimacy contributes to tempering anger resulting from perceived injustice, but only in the condition of low disadvantage (and not when disadvantage was high). These findings were thus consistent with H3 and H4. Finally, in line with H5, Study 3 highlighted the key role played by morality: only in the case of a relatively low perceived disadvantage (and not when disadvantage was high), authority legitimacy sequentially reduced the perception of moral value violation and, in turn, anger, which ultimately accounted for reduced intention to participate in collective actions.

### Theoretical Implications

These results have important theoretical implications for research on legitimacy of authority figures or group leaders. We provided evidence that the attenuating effect of legitimacy not only applies to emotions and compliance with authority (e.g. Cohen, 1986; Hegtvedt & Johnson, 2000; Johnson et al., 2016), but also to protest behaviours. This finding suggests that legitimacy is a powerful factor that guarantees group members’ compliance and cooperation with authority, as well as less opposition. By fuelling the legitimization of disadvantages, authority legitimacy renders the justification of any form of protest invalid, thereby discouraging involvement in social movements. Therefore, legitimacy would be underpinned by a belief whereby people ought to comply with the authorities and to suppress any resistance forces. From this perspective, legitimacy gives a crucial political weapon to maintain the authority’s power and to limit the sources of rebellion that may arise in the face of a decision with deleterious consequences for group members. It equips governance structures with an aura of protection securing the maintenance of their power and the exercise of their authority over group members while imposing changes that are detrimental to them. Besides, it is in the belief in the legitimacy of authorities that group members find the reasons for legitimizing unfair treatments and their temperament to oppose the hierarchy. However, such a “legitimate domination” is inherently unequal and contributes tremendously to perpetuating the disadvantages of those who are powerless by making them refrain from denouncing inequalities and fighting for justice and better living standards (see Walker, 2014).
However, the power of legitimate authorities in reducing protest tendencies is not unlimited. As we have demonstrated in our studies, the level of authority legitimacy can alter collective action intentions only in conditions depicting relatively low collective disadvantages. In Study 1, the disadvantages can be qualified as moderate (i.e. there was an increase in work time, but salary was left untouched), while they were either low or implicitly mentioned in Studies 2 and 3. As expected, the same pattern of results consistently came out in all these conditions. Taken as a whole, they have in common that the disadvantages can easily be accepted and justified by external reasons (i.e. beyond the authority’s responsibilities). They are ambiguous or uncertain enough, in terms of whether they are unfair or not, for people not to feel too much offended and for legitimacy to have a room to operate. In contrast, the condition of high disadvantage is obvious as to whether the authority’s actions are unfair or not. There is no doubt that people are confronted to unacceptable injustices that they cannot justify in any way.
Moreover, in line with the model in Study 3, one could argue that the conditions of low and high disadvantage mostly differ on how they challenge individuals’ moral values. Low disadvantages are likely to be viewed as not violating important moral stances. Therefore, individuals are less inclined to feel that they need to be redressed, especially when stemming from a legitimate authority. But when outcomes distribution is highly disadvantageous to the group, the legitimacy of the authority is overshadowed and loses its attenuating influence. In this condition, emotional and behavioural responses are shaped primarily by the moral values of individuals and not by the authority to which they no longer feel obliged to abide by the sole virtue of its legitimacy. In response to strong collective disadvantages, moral convictions take precedence over authority legitimacy in individuals’ motivation to protest. Consistent with previous studies (e.g. Skitka, 2002; Skitka et al., 2009), this tends to corroborate the notion that the deference to legitimate authorities, as well as the restraint that they impose on the desire to revolt, is confined to situations where moral convictions do not come into play. From the perspective of social change, this indicates that the fight against injustices among those in subordinate positions is possible, provided that their sense of morality may be on the alert and their moral values be infringed. Moral convictions serve as a guide for making a decision as to whether participation in collective actions and disobedience to authority are acceptable or should be repressed. When disadvantages are high, the perceived damage to one’s moral values signals that protesting is required, leaving legitimization processes unable to operate. While legitimacy constrains the desire to protest, since obligating to compliance through fear of informal sanctions by peers and formal sanctions by higher authorities, the violation of moral values frees individuals from such feelings of obligation and allows them to express their willingness to protest without restraint.
Moreover, our findings make an important contribution to social psychological research on collective actions. First, our research underscored the importance of authorities’ role in studying the psychological antecedents of collective actions. As daily news regularly makes the case (e.g. demonstrations against political leaders), authority figures do indeed have a large share of responsibility in their emergence and development. They can be trigger elements, as in the case of movements aimed at condemning the negligence or inefficiency of public authorities in managing a social issue, and also decisive sources of regulation, depending on whether procedures for negotiation with third parties (e.g. trade unions) or, conversely, the use of public forces (e.g. police) have been implemented. Therefore, since protest actions can hardly be abstracted from a broader political context involving different categories of potentially antagonistic sources of power, it seems essential to further reflect on the role of political actors and especially of authority figures in our understanding of individual tendencies to engage collectively (see, for example, Osborne et al., 2019). This will undoubtedly pave the way for stimulating avenues of research that could complement or challenge the state of current knowledge. Second, our findings add to the literature by reconsidering the well-documented relationship between perceived disadvantage and engagement in collective actions (Klandermans, 1997; Wright, 2001). Protest activities may not be necessarily at work as individuals experience group-based deprivations. Legitimacy of authority does matter a lot in this respect. As a result, perceived injustice should not be analysed separately from legitimacy as both predict collective actions in concert. Injustice and legitimacy always articulate one with the other and can simultaneously eliminate the effects of the other as a function of their potential perceived strength. This way, our work goes way beyond the well-documented research showing that injustice is a key precursor to collective actions, and we argue that inclusion of legitimacy over injustice perceptions can considerably augment our understanding of collective actions. Therefore, we strongly urge researchers to further explore this line of research and integrate authority legitimacy as a key construct into the predictions of collective action models.
Third, by illuminating the importance of moral concerns in collective actions, our research programme fits consistently with the findings of a growing body of previous research (e.g. Kutlaca et al., 2019; Mazzoni et al., 2015; Van Zomeren et al., 2011, 2012, 2018). Likewise, we found that moral value violation constitutes a key energizer of engagement in collective actions. However, we provided new pieces of evidence showing how moral violation is related to disadvantages and authority legitimacy. While previous research did not tell much on how morality and injustice are both associated on collective action tendencies, we have shown here that very acute disadvantages may strongly lead individuals to collective actions precisely because they break with individuals’ important moral stances. In this case, moral violation has such a potential that the legitimation processes are, to a certain extent, deactivated. In contrast, when moral values are not infringed by the collective disadvantages, engagement in collective actions crucially depends on whether the authority figure benefits from high or low legitimacy.

## Limitations

Despite these important theoretical implications, our research contains some limitations. One pertains to the employment of vignettes. The main problem in using vignettes as a research methodology is that their ecological validity is relatively low and hardly allows to generalize the findings to real-life collective actions. The artificiality of such a research design may not reflect natural or genuine responses. Vignettes produce reactions that individuals imagine they would have experienced and not reactions that they would have really had in real-life situations, especially in the view of issues and constraints related to the workplace (e.g. fear of dismissal, labour market instability). Although Study 3 recruited only participants who were potentially familiar with the context described in the vignettes, it remains quite uncertain whether they correctly imagined themselves in the situation described, or whether they all imagined exactly the same situations based on their own experiences. In future studies, our findings should be replicated in real-life protest settings in which participants are likely to be personally sensitive to the conditions of low and high disadvantage. For example, one might consider asking people about how they would support and be willing to participate in ongoing or forthcoming social movements (e.g. anti-austerity movements) and how this may be predicted by perceptions of perceived disadvantage (e.g. perceptions of income inequality between the elite and the majority of the population) and legitimacy of authority (e.g. government or public authorities). Against this backdrop, another potential issue is that the vignettes described a workplace environment. Therefore, it is plausible that our findings are strongly context dependent and cannot be easily transferable to political contexts. Future research should be conducted in various contexts to offer greater validity and generalization to the current findings. Furthermore, although intentions to protest have been shown to predict protest behaviours (de Weerd & Klandermans, 1999), our studies did not include direct measures of behaviour and cannot conclude on how disadvantage and legitimacy interact on actual participation in collective actions. Once more, conducting field studies might be a way to address this pitfall.

## Conclusion

Our studies have underscored the importance of the role of authorities in engaging individuals in collective actions. We have shown that an authority figure with strong legitimacy is likely to temper anger and desire to revolt in the face of disadvantage, to the extent it does not place individuals’ moral value system under threat. In this very case, the authority can no longer rely on legitimacy and will have to identify other means to contain possible uprisings and make people accommodate with an unfavourable situation. This reveals that group disadvantages, especially when they are not excessive and provoked by an authority who has gained strong legitimacy, may not necessarily lead to an intensive participation in protest actions. This may explain why, while socio-economic inequalities are still on the rise around the world (Piketty & Saez, 2014), the number of collective actions does not increase proportionally and remains paradoxically low among those who are the first to suffer (Jost et al., 2017). Based on our results, we can conclude that the belief in the legitimacy of political institutions or governance structures, which contributes to the legitimization of injustices, paralyses at the same time the possibility of attributing legitimacy to collective organizations and movements aimed at redressing social equity.

## Declarations

### Conflict of interest

We do not have any conflicts of interest to declare.

## Supplementary Information

Below is the link to the electronic supplementary material.

## Publisher's Note

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Footnotes
1
Throughout this manuscript, we consider injustice (or, more broadly, disadvantage) in reference to the dimension of distributive justice, which corresponds to what one person or group receives from a given distribution in relation to others or in relation to other groups. This dimension has largely been privileged in conceptualizations and operationalizations of perceived injustice in socio-psychological research on collective actions, particularly those developed around the RTD (see Van Stekelenburg & Klandermans, 2013). In parallel, procedural justice refers to the justice of formal policies surrounding outcome distribution and how authorities make decisions and treat group members (Blader & Tyler, 2003).

2
We are not suggesting that a condition of low injustice would not have moral implications, but rather that, at this level, moral convictions are sufficiently preserved for an authority to be able to assert its legitimacy as a source of coercion over group members. Consequently, the legitimacy, because it creates an obligation of deference to authority, replaces the application of moral standards, provided that individuals’ moral system itself be not profoundly defied by the authority’s actions or rules.

3
In this regard, it is important to note that research has rather shown that justice (and notably procedural justice) might be best conceptualized as a component of legitimacy than the converse (see Colquitt et al., 2001, 2005; Hegtvedt & Johnson, 2000; Tyler, 2006a).

4
We included a medium condition with the aim of examining the linearity of the relationship between legitimacy and collective action intentions, but also with the aim of offering a more nuanced and elaborated test of our hypotheses, which is often examined through only two conditions (i.e., high vs. low).

5
Drawing upon earlier works showing that collective actions can take several forms, ranging from moderate (or normative collective actions, i.e. actions that are in line with the acceptable norms in the dominant social system) to radical forms of (or non-normative collective actions; i.e., actions that break with such norms) collective actions (Becker & Tausch, 2015; Tausch et al., 2011), we also asked participants, for exploratory purposes, for their intention to participate in non-normative forms of collective actions (i.e., same questions were asked, but different examples were given, like “illegal occupation of workplaces”, “destruction of work-related equipment and materials”, or “use of violence”). But for the sake of clarity and conciseness, we did not report the corresponding findings in the manuscript, but as supplementary information.

6
Given that we expected that the more legitimacy is high, the less people would be willing to participate in collective actions, we tested here a linear relationship between the three conditions of legitimacy, so that differences are anticipated between all the conditions, with the medium condition in between.

7
For exploratory purposes, the present study also measured group efficacy, identification with the protesters, and moral convictions. Since these variables are central to understanding engagement in collective actions (VanZomeren et al., 2008), they were additionally included in the study. However, as they deviated from our initial theoretical framework, we did not raise particular hypotheses about them. Therefore, for greater clarity, details about the measures and results were not reported in the manuscript but as supplementary materials.

8
Initially, we differentiated between a measure of anger (as assessed in Studies 1 and 2) and moral outrage (assessed with the three additional items; see Thomas & McGarty, 2009). However, after running factorial analyses, it turned out that only one factor with eigenvalues greater than 1 was extracted, accounting for 85.58% of the total variance, and with very high factor loadings going from .89 to .95. Consequently, we concluded that both constructs were not clearly distinguished in participants’ mind and decided to aggregate all five items within one single measure.

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