Chicago
The ratification of the 18th amendment to the Constitution in 1919 made the production and sale (including exportation) of alcoholic beverages illegal in the United States. This ushered in the beginning of what is known as the Gangster Era, a time that roughly spans from 1919 until 1933 when Prohibition was repealed. The 1920s saw gangsters, including Al Capone, Dion O'Banion, Bugs Moran and Tony Accardo battle law enforcement and each other on the streets of Chicago during the Prohibition era. Chicago was the location of the infamous St. Valentine's Day Massacre in 1929, when Al Capone sent men to gun down members of a rival gang, North Side, led by Bugs Moran.
Atlantic City, New Jersey
The 1920s, with tourism at its peak, are considered by many historians as Atlantic City's golden age. During Prohibition, which was enacted nationally in 1919 and lasted until 1933, much liquor was consumed and gambling regularly took place in the back rooms of nightclubs and restaurants. It was during Prohibition that racketeer and political boss Enoch L. "Nucky" Johnson rose to power. Prohibition was largely unenforced in Atlantic City, and, because alcohol that had been smuggled into the city with the acquiescence of local officials could be readily obtained at restaurants and other establishments, the resort's popularity grew further. The city then dubbed itself as "The World's Playground". Nucky Johnson's income, which reached as much as $500,000 annually, came from the kickbacks he took on illegal liquor, gambling and prostitution operating in the city, as well as from kickbacks on construction projects.