Prohibition was the nationwide forbiddance of the sale of alcohol in the United States from 1920 to 1933. The operation was coordinated by the Anti-Saloon League, made up of Protestants from both political parties. A large majority of prohibitionists were women, so the male population resisted their efforts. Some amendments and acts that helped move the Prohibition movement along were the 18th Amendment authorizing the forbiddance, the Volstead Act enforcing the forbiddance, and the 21st Amendment repealing the 18th Amendment.