William J. Helmer
The St. Valentine's Day Massacre: The Untold Story of the Gangland Bloodbath That Brought Down Al Capone
The Complete Public Enemy Almanac: New Facts and Features on the People, Places, and Events of the Gangster and Outlaw Era: 1920-1940
Baby Face Nelson: Portrait of a Public Enemy
WILLIAM J. HELMER is the author of The Gun That Made the Twenties Roar and coauthor of Dillinger: The Untold Story and Baby Face Nelson. He lives in Maquoketa, Iowa.