Nicky Santoro is a fictional character from the 1995 film Casino, directed by Martin Scorsese. Portrayed by actor Joe Pesci, Nicky is a violent enforcer for the Chicago Outfit, a powerful organized crime syndicate. His character is known for his aggressive behavior and loyalty to his childhood friend, Ace Rothstein, played by Robert De Niro. In the film, Nicky's actions contribute to the downfall of the Las Vegas casino operation run by Ace. His reckless nature and disregard for the law create tension and conflict, ultimately leading to tragic consequences. Nicky Santoro's character is a representation of the darker side of organized crime in the 1970s.