FBI informant William O'Neal held the position of chief of security for the Illinois Black Panther Party — the person formally responsible for protecting Fred Hampton. He provided the floor plan of Hampton's apartment with Hampton's bed specifically marked, and spiked Hampton's drink with secobarbital the night before the raid. What specific tactical advantage did O'Neal's role as security chief give him that made him uniquely valuable to the FBI for this operation, beyond ordinary informant access?