Anthony Baez was playing football with his brothers one December evening in New York in 1994. The football accidentally hit a parked patrol car. An infuriated police officer grabbed Anthony and held him by the neck, then other officers knelt on his back as he lay down on the ground. Anthony choked to death. It emerged that the officer had a long history of brutality - there were at least 14 prior complaints against him - yet he was still on duty. He was put on trial but acquitted. The tragedy of...