Walking into Green Mill is like transporting yourself back to a 1920s speakeasy. Decked out in period furniture and décor from the Roaring Twenties, the jazz club was Al Capone’s favorite hangout (you can still sit in his booth today). Not surprisingly, the speakeasy’s got some noteworthy gang activity on the books: Jack McGurn, one of the owners, was known for using intimidation, bribery, blackmail, and violence to gain a stake in clubs across Chicago. When Joe E. Lewis, one of Green Mill’s most profitable acts, moved on and opened another venue, McGurn hired a hit man to beat him up—and cut out part of his tongue. Despite his injuries, Lewis survived the attack, and his recovery is rumored to have been funded by Capone.