Chicago Mobs of the Twenties

Chicago Mobs of the Twenties is a book detailing the history of organized crime in the Earth city of Chicago during the 1920's. The book was published in 1992 by Pocket Books.

A copy of the book was taken on board the Earth ship USS Horizon. As the Prime Directive had not yet been established, this copy was later given to the natives of the planet Sigma Iotia II, along with other materials by the crew of the Horizon. The Iotians saw the society depicted in the book as a perfect society, and rebuilt their society along those lines. Centuries later, after seeing the book Captain Kirk realized that the current state of Iotian society was not a natural development. He and Spock worked to undo the damage caused by that book to Iotian society.