Philip Michael Leonetti (born March 27, 1953) is an American former mobster who became the underboss of the Philadelphia crime family under his mentor, uncle and former boss, Nicodemo "Little Nicky" Scarfo, before becoming a government informant in 1989 after being sentenced to 45 years for racketeering. At that time, he was the highest-ranking member of the American Mafia to break his blood oath and turn informant. As part of his cooperation, he served just five years in prison, and later authored a book about the mob.