While statistics compiled by the group Campaign Zero show that police killings and shootings in Chicago have fallen following a set of reforms enacted after a federal investigation, advocates worry that the union will undermine them in contract negotiations. Police unions have traditionally used their bargaining agreements to create obstacles to disciplining officers. One paper by researchers at the University of Chicago found that incidents of violent misconduct in Florida sheriff’s offices increased by about 40 percent after deputies gained collective bargaining rights.

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