In 1968, Jerry Angiulo, a Boston mafiosi, dodged a murder conviction.

The FBI would spend decades and untold man-hours trying to bring him in. In doing so, however, a whole slew of agents found themselves not just dealing with the devil, but in bed with him. The FBI provided information to, and covered up for their criminal informants in the hope of putting together a charge that would stick on Angiulo.