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the beginning of what is known as the Gangster Era, a time that roughly spans from 1919 until 1933 when Prohibition was repealed.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.
Prohibition in the United States
At the same time, songs emerged decrying the act. After Edward, Prince of Wales, returned to the United Kingdom following his tour of Canada in 1919, he recounted to his father, King George V, a ditty he had heard at a border town:
Prohibition became highly controversial among medical professionals, because alcohol was widely prescribed by the era's physicians for therapeutic purposes. Congress held hearings on the medicinal value of beer in 1921. Subsequently, physicians across the country lobbied for the repeal of Prohibition as it applied to medicinal liquors. From 1921 to 1930, doctors earned about $40 million for whiskey prescriptions.