close Fox Nation's 'Gotti's Guy' shares chilling look inside the mafia Lewis Kasman, former right-hand man to John Gotti, tells Fox Nation, 'I knew how we was, and I knew what he was capable of, but I wasn't in fear of him.' Sammy "The Bull" Gravano is known as the Mafia power who betrayed his own boss, John Gotti, and sent him away to prison for life. But he is revealing a surprising sense of personal affection that he had for the Mob Godfather. "I loved him," he said. "I got to like the guy.