The ratification of the 18th amendment, that banned alcohols like liquor, beer, and wine across the country, started January 16th, 1919 and lasted until 1933.
No person shall, on or after the date when the 18th Amendment to the Constitution of the United States goes into effect, manufacture, sell, barter, transport, import, export, deliver, furnish or possess and intoxicating liquor except as authorized in this act. --Title II, Section 3, National Prohibition Act
People would pretend to be Jewish so that they could get a religious exemption to drink alcohol.
People could also get medical exemptions to drink.
"Everybody calls me a racketeer. I call myself a businessman. When I sell liquor, it's bootlegging. When my patrons serve it on a silver tray on Lake Shore Drive, it's hospitality." -Al Capone