KnowraSammy GravanoLinked fromLinked fromThe 4 pages that link to Sammy Gravano, each with the reason it gives.All 4Related 4Gambino crime familyRelated: His testimony helped secure Gotti’s conviction and exposed the family’s inner workings.John GottiRelated: His testimony helped secure Gotti’s 1992 conviction.Paul CastellanoRelated: His testimony helped secure convictions against Gotti and other figures tied to the family’s later leadership.Joseph MassinoRelated: Gravano’s earlier cooperation provides a precedent, though Massino was the first New York boss to testify.