The ratification of the 18th Amendment to the U.S. Constitution–which banned the manufacture, transportation and sale of intoxicating liquors–ushered in a period in American history known as Prohibition. The result of a widespread temperance movement during the first decade of the 20th century, Prohibition was difficult to enforce, despite the passage of companion legislation known as the Volstead Act. The increase of the illegal production and sale of liquor (known as “bootlegging”), the proliferation of speakeasies (illegal drinking spots) and the accompanying rise in gang violence and other crimes led to waning support for Prohibition by the end of the 1920s. In early 1933, Congress adopted a resolution proposing a 21st Amendment to the Constitution that would repeal the 18th. It was ratified by the end of that year, bringing the Prohibition era to a close.