SG
Sammy Gravano

Sammy Gravano

Salvatore "Sammy the Bull" Gravano is an American gangster who became underboss of the Gambino crime family. Gravano played a major role in helping the prosecution sentence John Gotti, the crime family's boss, by agreeing to testify as a government witness against him and other mobsters in a deal in which he confessed to involvement in 19 murders.
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