The Secret Six, officially known as the Crime Prevention and Punishment Committee of the Chicago Association of Commerce (CAC), was a well-funded and powerful vigilante enterprise established by the Association (now the Chicagoland Chamber of Commerce) in February 1930. The group inspired a movie by the same name, was credited by Al Capone for his downfall, helped launch Eliot Ness and his Untouchables, and briefly served as a model for vigilante organizations across America.