Unravel the secrets of the Mafia's most notorious members, including Sam Giancana, who had ties to the Kennedys and Frank Sinatra; John Gotti, known as ‘Teflon Don' after being acquitted three times; Carmine Galante, who profited from his drug empire while in prison; and the real Donnie Brasco, an FBI agent who worked undercover to bring the Mafia down from within.