Charles Macavoy is a member of the mercenary group led by Packer and tasked with finding and stopping Abby Monroe and Shayn Coleman. He was arrested along with his group members and Reese (all on suspicion of being the "Man in the Suit") when the FBI raided the bank where Reese had previously helped Abby and Shayn escape. (“Shadow Box”)
At Rikers Island, he was prepared to give Reese up in exchange for blanket immunity, but Finch threatened to blackmail him and he was forced to change his mind, instead claiming that his co-worker, Wayne Packer was the Man in the Suit. (“Prisoner's Dilemma”)