America's leading Mafia family was lead by John Gotti. His right hand man, Sammy Gravano, claimed to have killed 39 men on the orders of his boss. It earned him the right to succeed Gotti. However, Gravano chose another path. He decided to betray Gotti and become a government witness during Gotti's organised crime trial. Gravano was called King Rat and his testimony put Gotti in jail. Gravano was hidden in the witness protection program in Arizona. However, it seemed he could not stay straight. He ran a drug ring from his home and was ultimately caught by authorities. This time there was no protection, as the FBI threw the book at him. We have the tapes, the betrayal and the full story of one of the world's most notorious killers.