Al Capone was a notorious American gangster who turned organized crime into a national business operation during the 1920s Prohibition era. He established monopolies over criminal activities in various cities and states, and divided up territories across the U.S. at a national crime convention. Capone innovated the use of modern technology and business tactics to eliminate competition and ensure efficient bootlegging operations. He also gained protection through bribing police and politicians, establishing a secure base in Cicero, Illinois where he faced little law enforcement intervention. While the public both admired and feared Capone, his criminal empire indirectly contributed to the repeal of Prohibition.