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the beginning of what is known as the Gangster Era, a time that roughly spans from 1919 until 1933 when Prohibition was repealed.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.
Anti-Saloon League
It was a key component of the Progressive Era, and was strongest in the South and rural North, drawing heavy support from pietistic Protestant ministers and their congregations, especially Methodists, Baptists, Disciples and Congregationalists. It concentrated on legislation, and cared about how legislators voted, not whether they drank or not. Founded as a state society in Oberlin, Ohio, in 1893, its influence spread rapidly. In 1895, it became a national organization and quickly rose to become the most powerful prohibition lobby in America, overshadowing the older Woman's Christian Temperance Union and the Prohibition Party. Its triumph was nationwide prohibition locked into the Constitution with passage of the 18th Amendment in 1920. It was decisively defeated when Prohibition was repealed in 1933.