Witness to the Mob (1998)

Sammy The Bull Gravano was mafiosi He started out as a soldier but his talent for murder including the slayings of his best friends his wifes brother and his own boss Paul Castellano saw him rise to underboss in the Gambino crime family However betrayals within the family saw him break the code of silence and became the highest ranking member of the mob to turn into a rat a rat in a suit assisting the government to finally put away the Teflon Don John Gotti