The U.S. government poisoned alcohol during Prohibition.

Despite the ban, the demand for alcohol remained high. Bootlegging — illegal production, smuggling, and selling of liquor — thrived. Illegitimate drinking spots known as speakeasies flourished, with approximately 30,000 of them existing in just New York City alone by decade’s end. As the defiance against liquor laws intensified, authorities managed to mitigate smuggling from other countries; the bootleggers, however, responded by stealing massive quantities of industrial alcohol — used in automotive fluids, paints, and medical supplies — and refining it to make it drinkable (it became the country’s top source of liquor). Then, the U.S. government tried to beat the rum-runners at their own game. In 1926, President Calvin Coolidge’s administration mandated that manufacturers add even more dangerous chemicals to their industrial products — substances such as gasoline, formaldehyde, and the easily lethal methanol — to dissuade the underground industries and their customers.

Organized crime started because of Prohibition.

Before Prohibition, organized crime was mostly limited to small gangs who were involved in petty neighborhood extortion and loan-sharking. When the 1920 ban on alcohol went into effect, mobsters became the key players in the illicit alcohol trade, procuring, producing, and selling liquor illegally all over the U.S. Profits got so big, so fast, that these once small-time criminals and mafias learned to be more “organized” than ever, hiring lawyers, accountants, truckers, and more to help run their illicit businesses. They also started working with other criminal groups, effectively creating underground syndicates. Powerful crime families led by figures such as Charles “Lucky” Luciano and the notorious Al Capone emerged, making millions of dollars in the process. The enormous profits fueled the growth and expansion of organized crime, which continued even after the repeal of Prohibition.