Philip "Crazy Phil" Leonetti (born March 27, 1953) is a Philadelphia gangster who became the underboss of the Philadelphia crime family under his uncle, Nicodemo "Little Nicky" Scarfo, before becoming a government informant. At the time, he was the highest-ranking member of the American Mafia to break his blood oath and turn informer. His criminal record includes racketeering charges and ten murders.