STUDIES:   

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“Police unions publicly and aggressively defend police officers accused of misconduct… Unions have opposed policy changes designed to foster better police–community relations, particularly the current issue of racial profiling."

The Neglect of Police Unions: Exploring One of the Most Important Areas of American Policing The Neglect of Police Unions: Exploring One of the Most Important Areas of American Policing
The Neglect of Police Unions: Exploring One of the Most Important Areas of American Policing
Police Practice and Research
Walker, Samuel
Vol. 9 Issue 2, pp. 95–112, 2008
10.1080/15614260802081253
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