Chicago cops have nasty habit of beating innocent people to a pulp.
The latest victims are a PhD management consultant and a University of Chicago grad student who had the audacity to stand up and put on his coat as he was leaving a restaurant. The grad student inadvertently blocked the path of a plainclothes police officer who was also leaving the restaurant. If you know Chicago cops, you know what comes next: a brutal beating in the parking lot; uniformed officers show up and do nothing, and one of the victims is threatened when he shows up at the police station to file a complaint.
Never file a complaint against Chicago PD without your attorney present.
Here's a small sampling of police criminality cases in Chicago. The mayor has been serious about putting an end to this nonsense. He even went outside the system, replacing the last police superintendent with Jody Weis, an FBI man. Cops openly despise the new superintendent. Of course, they can identify dozens of failures on the part of the superintendent, but the one matter they refuse to address is the anti-snitching mentality in their own ranks. Police here complain that witnesses to crimes have an anti-snitching mentality, but the complaint rings hollow when cops won't snitch on criminal cops.
Social psychologists could probably say a great deal about the problem of police violence and corruption, but I don't know if anyone in policing pays attention to the research. I know that cops have, by and large, ignored the compelling research on false confessions and faulty eyewitness testimony. Are they ready to address police violence by listening to Philip Zimbardo? I doubt it.