1934 was a pivotal year in the ongoing battle between the FBI and America's most famous outlaws -- it was a year of giant personalities and huge shoot-outs, and it marked the deaths of John Dillinger, Bonnie and Clyde, and Pretty Boy Floyd, among others. But that year, FBI agent Sam Cowley's priority was to nab the most dangerous gangster this country has ever produced, a man so violent he scared Al Capone and was booted from the Chicago mob -- Baby...