May 17, 1945 - Sammy Gravano
His cooperation with federal prosecutors in 1991 marked one of the most significant defections in American organized crime history, delivering a conviction against John Gotti that previous prosecutions had failed to achieve. Having admitted to involvement in nineteen murders, Gravano traded his testimony for a reduced sentence — a calculation that reshaped the Gambino family and demonstrated how thoroughly the government could dismantle even a tightly guarded criminal hierarchy when an insider turned. The arc from street associate to underboss to star witness compressed nearly every element of mob ambition and institutional vulnerability into a single career.
From Wikipedia
Salvatore "Sammy the Bull" Gravano (born March 12, 1945) is an American former mobster who rose to the position of underboss in the Gambino crime family of New York City before becoming a government witness. As the underboss, Gravano played a major role in prosecuting John Gotti, the crime family's boss, by agreeing to testify as a government witness against him and other mobsters in a deal. As part of the agreement, Gravano confessed to his involvement in at least 19 murders, although he was also responsible for a number of other crimes.
Originally an associate for the Colombo crime family, and later for the Brooklyn faction of the Gambino family, Gravano was part of the group in 1985 that conspired to murder Gambino boss Paul Castellano. Gravano played a key role in planning and executing Castellano's murder, along with John Gotti, Angelo Ruggiero, Frank DeCicco, and Joseph Armone.
Soon after Castellano's murder, Gotti elevated Gravano to become an official captain after Salvatore "Toddo" Aurelio stepped down, a position Gravano held until 1987 when he became consigliere. In 1988, he became underboss, a position he held at the time he became a government witness. In 1991, Gravano agreed to turn state's evidence and testify for the prosecution against Gotti after hearing the boss making several disparaging and untrue remarks about Gravano on a wiretap that implicated them both in several murders.
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