From the New York Times:
The release last month of a 2014 video showing a Chicago police officer fatally shooting another teenager, Laquan McDonald, has upended this city. The police superintendent, Garry F. McCarthy, was forced out despite a reduction in crime citywide. So was the leader of an authority charged with disciplining officers. The Justice Department has opened an investigation into possible civil rights abuses by the Police Department. Demonstrators call nearly every day for Mayor Rahm Emanuel to resign.
But the Chicago Police Department’s record of brutality began long before Mr. McDonald, 17, lay crumpled on Pulaski Road. For decades — back to violent clashes at the Democratic National Convention in 1968 and the confessions coerced by a “midnight crew” of detectivesaccused of using suffocation, electric shock and Russian roulette on black men in the 1970s and 1980s — the Chicago police have wrestled with allegations of torture, racism, weak oversight and a code of silence….
In Chicago, the nation’s third-largest city, officers shot and killed 70 people, most of them black, in a five-year span ending in 2014. That was the most among the nation’s 10 largest cities during the same period, according to the Better Government Association, a nonprofit watchdog organization.The Chicago Police Department has also been known for issuing little or no punishment to its own, even after a 2007 overhaul of its discipline system that was portrayed as creating a tough, autonomous authority.