Salvatore "Sammy the Bull" Gravano rises from a Brooklyn street kid with Colombo family ties into underboss of the Gambino crime family, then becomes the highest-ranking Cosa Nostra figure ever to testify for the government. This film traces that arc through his early alliance with John Gotti's Brooklyn faction, his role in the 1985 conspiracy to kill boss Paul Castellano alongside Gotti, Angelo Ruggiero, Frank DeCicco, and Joseph Armone, and his climb to second-in-command once Gotti took over. It lays out how Gravano's decision to cooperate with the FBI handed prosecutors an insider's account of the family's operations and helped convict Gotti, ending the boss's reputation as untouchable. The narrative treats his 1994 flip as the hinge point of the story, the moment loyalty gave way to survival and set off a chain of other mob defections. Born in 1945 and raised inside the Five Families' hierarchy, Gravano emerges here as both architect and demolisher of the same criminal structure.