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Salvatore "Sammy the Bull" Gravano (born March 12, 1945) is an American former mobster and the underboss of the Gambino Crime Family from 1990 to 1991, as well as its consigliere from 1987 to 1990. The second-In-command to Family boss John Gotti, Gravano became a cooperating witness against him in late 1991 after secret FBI tape recordings of Gotti criticizing and incriminating Gravano in several illicit activities were made public. As part of his plea agreement, Gravano confessed to his involvement in 19 murders.