Chicago violence and regulations.

Chicago Tribune: Five months after the ACLU called the number of street stops by Chicago police "shocking," the two sides have reached what they called a landmark agreement on the controversy, appointing a retired federal magistrate judge to oversee a number of reforms and instituting heightened training for the department's 12,000 officers and supervisors.

As part of the agreement, Chicago police will keep track of all investigatory street stops and protective pat-downs, not just those that don't result in an arrest, as they have done in recent years. That practice had made it hard to assess the full impact of the street stops on the public, especially minorities, according to the ACLU.

Effective Aug 2015.  Today we have:

USA Today:  — Murders in the nation's third-largest city are up about 72%, while shootings have surged more than 88% in the first three months of 2016 compared with the same period last year, according to data released Friday by the Chicago Police Department. 

The Baltimore story repeated.   It has been going on for three generations, actually.  Residents kick the cops out, violence rises to unbearable levels, residents demand the cops return.