The 18th Amendment established Prohibition in the United States from 1920 to 1933, banning the production, importation, transportation, and sale of alcoholic beverages. However, Prohibition had unintended consequences as it did not stop Americans from drinking alcohol. Bootleggers and organized crime flourished by illegally supplying the demand. Speakeasies, which were secret bars that sold alcohol, also proliferated during this time. Prohibition ultimately failed in its goal and was repealed by the 21st Amendment in 1933.