Even though the United States has a great diversity for criminal activity, one of the most notable forms of crime is the American Mafia. This organized system of crime operated in major cities such as New York and Chicago. Organized crime was first notably practiced in the United States during the 1920s, the prohibition era, granting the ability for controlled trade of liquor. After the prohibition era, the Mafia began getting involved with labor unions, businesses, and drug-trafficking. One notable figure, Al Capone, is usually revered as the most famous Mobster in United States history. In addition to his crimes, mobsters as well as Al Capone have been inducted as Pop Culture icons in modern day America.