In his memoir, Bonanno theorized that Cuban exiles and the Cosa Nostra murdered President John F. Kennedy. He stated that several Cosa Nostra families shared close ties with members of the Cuban exile movement dating back to the mob casinos in Havana before the Cuban Revolution. According to Bonanno, both the Cubans and the Cosa Nostra hated Kennedy enough to kill him. Many exiled Cubans blamed Kennedy for the failure of 1961 Bay of Pigs Invasion of Cuba. The Cosa Nostra felt betrayed when Kennedy's brother and Attorney General, Robert F. Kennedy, opened a strong legal assault on the mob, despite the mob's alleged support for Kennedy in the 1960 presidential election. Bonanno said that he realized the degree of Cosa Nostra involvement in the assassination when he witnessed on television Jack Ruby, an associate of Chicago Outfit mobster Sam Giancana, killing Kennedy assassin Lee Harvey Oswald while in police custody. Bonanno also claimed in the book that he had discussed the assassination of President John F. Kennedy with mobster John Roselli and implicated him as the primary hitman in a conspiracy instigated by the mob. According to Bonanno, Roselli fired at Kennedy from a storm drain on Elm Street.