Prohibition: causes, enforcement and failure
America Goes Dry
On 17 January 1920, the Prohibition came into force across the United States. The 18th Amendment to the Constitution, ratified in January 1919, had banned the production, sale, and transportation of intoxicating liquors. The Volstead Act, passed in October 1919, defined the legal threshold (anything over 0.5 per cent alcohol) and gave enforcement powers to federal agents. The ambition was sweeping: to eliminate drunkenness, domestic violence, poverty, and crime by removing alcohol from American life. The reality was very different.
Prohibition grew from three overlapping movements: the Protestant temperance movement, which had campaigned for decades against drinking as a moral evil; the Progressive reformers, who argued that alcohol was the root cause of urban poverty and domestic abuse; and a strand of nativism, which associated alcohol with German beer halls and southern European wine-drinking immigrants. The Anti-Saloon League, led by Wayne Wheeler, co-ordinated this coalition and was the most effective single-issue pressure group in American history to that point.
Enforcement and Its Failures
From the outset, Prohibition was extraordinarily difficult to enforce. The Volstead Act created a federal Prohibition Bureau, but it was chronically underfunded and its agents were notoriously susceptible to bribery. In 1920, there were only about 1,500 agents covering the entire country. Large sections of the American public — particularly in cities, among immigrant communities, and in wealthier social circles — had no intention of stopping drinking.
Illegal drinking establishments, known as speakeasies, multiplied across American cities. New York City, which had roughly 15,000 legal bars before Prohibition, was estimated to have between 20,000 and 30,000 speakeasies by the late 1920s. Bootleggers supplied them through a combination of domestic illegal distillation, smuggling from Canada and the Caribbean, and the diversion of industrial alcohol.
Al Capone’s organisation in Chicago demonstrated how far Prohibition had failed. By the late 1920s, Capone’s criminal network was earning an estimated $60 million a year from bootlegging, gambling, and other illegal activities. He employed hundreds of people and had bribed significant numbers of police officers and city officials. The St Valentine’s Day Massacre of February 1929, in which seven members of a rival gang were shot dead, showed the murderous competition for control of bootlegging territory. Capone was eventually convicted — not for bootlegging but for tax evasion — in 1931.
Prohibition accelerated the growth of organised crime in American cities. Criminal networks that had previously focused on gambling and prostitution expanded massively into the alcohol trade, using violence to enforce territory and corruption to neutralise law enforcement. Federal agent Eliot Ness and his team, nicknamed the “Untouchables” for their refusal to take bribes, became famous for their raids on Capone’s breweries — but their victories were largely tactical rather than strategic. The Capone organisation survived and adapted repeatedly.
Corruption was not limited to Chicago. In major cities across the country, Prohibition created a system in which police, judges, and politicians accepted payment to allow the illegal trade to operate. This widespread corruption damaged public respect for law enforcement and the legal system more broadly, contributing to the eventual political momentum for repeal.
The Road to Repeal
Support for Prohibition weakened through the late 1920s and collapsed during the Great Depression. The economic argument shifted decisively: a legal alcohol industry would generate tax revenue and jobs at precisely the moment the government needed both. The Association Against the Prohibition Amendment, funded by wealthy industrialists, lobbied effectively for repeal. Franklin Roosevelt, who supported repeal, won the 1932 election in a landslide. The 21st Amendment, ratified in December 1933, ended Prohibition — the only time a constitutional amendment has been repealed in American history.
Historians note that Prohibition was not a total failure. Alcohol consumption did fall significantly in the early years of Prohibition — cirrhosis death rates dropped, arrests for public drunkenness declined, and there is evidence of reduced domestic violence in some areas. But these gains were largely reversed as the bootlegging economy grew. By the mid-1920s, drinking was widespread again, concentrated in cities and among the middle class. The rural Protestant communities that had driven Prohibition remained broadly supportive throughout, while urban, immigrant, and working-class communities rejected it consistently.