What was the event that gave the Mafia a secure foothold in many U.S.cities?

Question

Quizplus · Accepted Answer

Prohibition, which lasted from 1920 to 1933, banned the production and sale of alcohol in the United States. This created an immense demand for illicit alcohol, which the Mafia was able to profit from by controlling the production, transportation, and sale of bootleg liquor. This gave the Mafia a secure foothold in many U.S. cities, as they became a major source of illegal alcohol and were able to use the profits to expand their criminal operations.

What Was the Event That Gave the Mafia a Secure