Salvatore "Sammy the Bull" Gravano, former Gambino family underboss, Mafia hit man came out of hiding to provide damning evidence against Vincent "The Chin" Gigante. Gigante faced 21 counts of murder and racketeering in Brooklyn federal court.

Gravano's testimony in a 1992 trial helped convict Gotti. He attended Mafia meetings with John Gotti, Gambino family boss and the leader of the Genovese crime, Vincent "The Chin" Gigante. "Chin was the boss," Gravano, 52, said.

Gravano is not well educated, but he's smart and decisive. The uncharismatic workhorse defined his ambition by saying, ''You can't be a thug forever if you want to get ahead. Somewhere along the line, you have to learn to be a racketeer as well.''

After 4 years, John Gotti strikes back at Gravano. Gotti claims Gravano or prosecutors hid Gravano was involved in two murders: the 1972 shooting death of a car salesman and a 1976 beating death of a car dealer. Gotti claims Gravano tried to import 10,000 pounds of cocaine in 1991.

VHS Witness to the Mob (1998) The rise of mobster Sam Gravano, whose testimony put John Gotti and others in jail.

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