“So Sammy "the Bull" Gravano had falsely reported that DiB (Robert DiBernardo) was being subversive in order to get John Gotti to kill him, all so Gravano could take over the lucrative construction racket.” CowardMobstersRatInformantCrime FamilyDouble CrossGambino SSammy The Bull Book:The Gotti Wars: Taking Down America's Most Notorious Mobster Source: The Gotti Wars: Taking Down America's Most Notorious Mobster