Its the story of 1930s Chicago during prohibition. The infamous gangster Al Capone had gained control of the city through buying off politicians, law enforcement officers, even the mayor, so that he can run his illegal organization. To battle this corruption, the U.S. Treasury department sends Agent Eliot Ness to put together a team to basically bring down Capone. This team of treasury agents and local law enforcement could not be bought off by Capone, hence the name "Untouchables". Eventually, Capone is sentenced to prison for tax evasion.