In the predawn hours of December 4, 1969, fourteen Chicago Police officers, claiming they were searching for illegal weapons, crashed into a first floor apartment on Chicago’s Monroe Street and opened fire. Inside were nine members of the Illinois Black Panther Party, including the rising star of the chapter, Fred Hampton.

The police claimed the apartment’s occupants fired on them, but after a fusillade of more than ninety bullets, the only people shot were Panthers, including Mark Clark and Hampton, who were dead. The picture of grinning cops carrying Hampton’s body out of the apartment that circulated in the wake of the killing said it all: the Chicago Police Department (CPD) had wanted Hampton dead. Their mission was accomplished.

The Chicago police, however, were not the only ones celebrating. We now know that within days of the murderous operation, the Federal Bureau of Investigation (FBI) awarded their Special Agent Roy Martin Mitchell, the handler of the informant who was key to the raid, a $200 bonus for work well done. This, and other information is contained in documents obtained by Aaron Leonard — posted here for the first time — via a Freedom of Information Act (FOIA) request.