In the movie "Casino," Joe Pesci's character, Nicky Santoro, is killed due to his increasing violence and erratic behavior, which posed a threat to the mob's operations in Las Vegas. The character's violent actions and lack of control led to his downfall, resulting in his ultimate demise.
Sam states that the bosses did not authorize the bombing because they had "other ideas" for him. In 1986, the bosses, finally fed up with Nicky's recklessness and attempt on Sam's life, order Frankie and his crew to kill Nicky and Dominick.