What families make up the Irish mafia?

The Irish mafia is primarily associated with organized crime groups in the United States, particularly in cities like Boston and New York. Key families include the Winter Hill Gang, led by James "Whitey" Bulger, and the Westies, based in Hell's Kitchen. Additionally, the Irish Mob has historical ties with various Italian-American crime families, often collaborating on criminal enterprises. While not as prominent as Italian organized crime, the Irish mafia has had a significant influence on American crime history.