History Channel : The American Mafia

The American Mafia, an Italian-American organized-crime network with operations in cities across the United States, particularly New York and Chicago, rose to power through its success in the illicit liquor trade during the 1920s Prohibition era. After Prohibition, the Mafia moved into other criminal ventures, from drug trafficking to illegal gambling, while also infiltrating labor unions and legitimate businesses such as construction and New York’s garment industry.