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the beginning of what is known as the Gangster Era, a time that roughly spans from 1919 until 1933 when Prohibition was repealed.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.
Temperance movement in the United States
The last wave of temperance in the United States saw the rise of the Anti-Saloon League (ASL), which successfully pushed for National Prohibition from its enactment in 1920 to its repeal in 1933. This heavily prohibitionist wave attracted a diverse coalition: doctors, pastors, and eugenicists; Klansmen and liberal internationalists; business leaders and labor radicals; conservative evangelicals and liberal theologians.