The FBI also conspired with the police departments of many U.S. cities (San Diego, Los Angeles, San Francisco, Oakland, Philadelphia, Chicago) to encourage repeated raids on Black Panther homes—often with little or no evidence of violations of federal, state, or local laws—which resulted directly in the police killing many members of the Black Panther Party, most notably Chicago Black Panther Party Chairman Fred Hampton on December 4, 1969. Before the death of Hampton, long-term infiltrator, William O'Neal, shared floor plans of his apartment with the COINTELPRO team. He then gave Hampton a dose of secobarbital that rendered Hampton unconscious during the raid on his home.