Thanks to Prohibition, criminal gangs were a dime a dozen in the 1920s and '30s, but the Karpis/Barker Gang became one of the era's longest lived, highest profile, and most consequential. During the Depression, their exploits not only burnished the reputation of the FBI and its director J. Edgar Hoover, but also inadvertently triggered the end to rampant corruption in St. Paul Minnesota.  While its body count was hefty -- and included lawmen like a sheriff gunned down in cold blood -- its enduring reputation hinges on its supposed matriarch, Ma Barker, who would go on to be depicted in movies and TV shows as a gun-toting criminal mastermind. There's no question three of her sons, and plenty of their friends, were stone-cold killers, but was Ma really pulling all the strings? "Crimes of the Centuries" is a podcast from Grab Bag Collab exploring forgotten crimes from times past that made a mark and helped change history. Follow us on Instagram and Twitter: @centuriespod