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the beginning of what is known as the Gangster Era, a time that roughly spans from 1919 until 1933 when Prohibition was repealed.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
Most economists during the early 20th century were in favor of the enactment of the Eighteenth Amendment (Prohibition). Simon Patten, one of the leading advocates for prohibition, predicted that prohibition would eventually happen in the United States for competitive and evolutionary reasons. Yale economics professor Irving Fisher, who was a dry, wrote extensively about prohibition, including a paper that made an economic case for prohibition. Fisher is credited with supplying the criteria against which future prohibitions, such as against marijuana, could be measured, in terms of crime, health, and productivity. For example, "Blue Monday" referred to the hangover workers experienced after a weekend of binge drinking, resulting in Mondays being a wasted productive day. But new research has discredited Fisher's research, which was based on uncontrolled experiments; regardless, his $6 billion figure for the annual gains of Prohibition to the United States continues to be cited.