O'Reilly and co-author Martin Dugard trace the brutal history of 20th Century organized crime in the United States, and expertly plumb the history of this nation's most notorious serial robbers, conmen, murderers, and especially, mob family bosses. Covering the period from the 1930s to the 1980s, O'Reilly and Dugard trace the prohibition-busting bank robbers of the Depression Era, such as John Dillinger, Bonnie & Clyde, Pretty Boy Floyd and Baby-Face Nelson.
