The term 'NESS NEMESIS' refers to two of the most notorious gangsters of the 1920s, Al Capone and Frank Nitti. The crossword solutions for this term are 'NITTI' (5 letters) and 'CAPONE' (6 letters). Al Capone was an American mobster who ran an organized crime syndicate in Chicago during the Prohibition era. Frank Nitti was a member of Capone's gang and eventually took over the organization after Capone was imprisoned.