Most significant Mafia crime families got their start during what events/era in the United States?

Question

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Most significant Mafia crime families got their start during Prohibition in the 1920s and early 1930s, where there was a huge demand for illegal alcohol and organized crime took advantage of the opportunity to make large profits. This era also saw the rise of political corruption and violence, which helped the Mafia establish their power and influence in American society.

Most Significant Mafia Crime Families Got Their Start During What