Eliot Ness' foe was Al Capone (8 letters) and Frank Nitti (5 letters). Al Capone was a notorious gangster who ran organized crime in Chicago during the 1920s and 1930s. He was known for his involvement in bootlegging, gambling, and prostitution. Frank Nitti was an Italian-American mobster who worked for Al Capone and was his right-hand man. He was also involved in bootlegging and other illegal activities. Both men were targeted by Eliot Ness, a law enforcement officer who was part of the Untouchables, a group of federal agents tasked with bringing down organized crime in the United States.