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This study explores two issues about police legitimacy. The first issue is the relative importance of police legitimacy in shaping public support of the police and policing activities, compared to the importance of instrumental judgments about (1) the risk that people will be caught and sanctioned for wrongdoing, (2) the performance of the police in fighting crime, and/or (3) the fairness of the distribution of police services. Three aspects of public support for the police are examined: public compliance with the law, public cooperation with the police, and public willingness to support policies that empower the police. The second issue is which judgments about police activity determine people's views about the legitimacy of the police. This study compares the influence of people's judgments about the procedural justice of the manner in which the police exercise their authority to the influence of three instrumental judgments: risk, performance, and distributive fairness. Findings of two surveys of New Yorkers show that, first, legitimacy has a strong influence on the public's reactions to the police, and second, the key antecedent of legitimacy is the fairness of the procedures used by the police. This model applies to both white and minority group residents.

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The group engagement model expands the insights of the group-value model of procedural justice and the relational model of authority into an explanation for why procedural justice shapes cooperation in groups, organizations, and societies. It hypothesizes that procedures are important because they shape people's social identity within groups, and social identity in turn influences attitudes, values, and behaviors. The model further hypothesizes that resource judgments exercise their influence indirectly by shaping social identity. This social identity mediation hypothesis explains why people focus on procedural justice, and in particular on procedural elements related to the quality of their interpersonal treatment, because those elements carry the most social identity-relevant information. In this article, we review several key insights of the group engagement model, relate these insights to important trends in psychological research on justice, and discuss implications of the model for the future of procedural justice research.

Legitimacy is a psychological property of an authority, institution, or social arrangement that leads those connected to it to believe that it is appropriate, proper, and just. Because of legitimacy, people feel that they ought to defer to decisions and rules, following them voluntarily out of obligation rather than out of fear of punishment or anticipation of reward. Being legitimate is important to the success of authorities, institutions, and institutional arrangements since it is difficult to exert influence over others based solely upon the possession and use of power. Being able to gain voluntary acquiescence from most people, most of the time, due to their sense of obligation increases effectiveness during periods of scarcity, crisis, and conflict. The concept of legitimacy has a long history within social thought and social psychology, and it has emerged as increasingly important within recent research on the dynamics of political, legal, and social systems.