Nitti's Nemesis was the nickname given to Eliot NESS, an American Prohibition agent who was famous for his efforts to bring down Al Capone and the Chicago Outfit. NESS was a key figure in the enforcement of Prohibition laws in the United States and was known for his incorruptibility and relentless pursuit of justice. He was nicknamed Nitti's Nemesis because he was the nemesis of Al Capone's right-hand man, Frank Nitti.