Chicago
The ratification of the 18th amendment to the Constitution in 1919 made the production and sale (including exportation) of alcoholic beverages illegal in the United States. This ushered in the beginning of what is known as the Gangster Era, a time that roughly spans from 1919 until 1933 when Prohibition was repealed. The 1920s saw gangsters, including Al Capone, Dion O'Banion, Bugs Moran and Tony Accardo battle law enforcement and each other on the streets of Chicago during the Prohibition era. Chicago was the location of the infamous St. Valentine's Day Massacre in 1929, when Al Capone sent men to gun down members of a rival gang, North Side, led by Bugs Moran.
Repeal of Prohibition in the United States
During this period, support for Prohibition diminished among voters and politicians. John D. Rockefeller Jr., a lifelong nondrinker who had contributed between $350,000 and $700,000 to the Anti-Saloon League, announced his support for repeal because of the widespread problems he believed Prohibition had caused. Influential leaders, such as the du Pont brothers, led the Association Against the Prohibition Amendment, whose name clearly asserted its intentions.