The Prohibition Era lasted from 1920 to 1933, during which the sale and consumption of alcohol was banned nationwide by the 18th Amendment. This led to the rise of illegal speakeasies and bootlegging operations run by organized crime. While temperance groups hoped to reduce crime and social problems, the ban generally had the opposite effect and increased criminal activity. It was an ultimately unsuccessful policy that was repealed by the 21st Amendment in 1933.