Charles Pretty Boy Floyd became the FBI's most wanted man in America.
A depression era young man out of the Oklahoma Hill country decided he no longer wanted to work as a field hand and common laborer. Everywhere in the Dirty 30s, men, and in one case, women (Bonnie Parker) had decided to use a gun to get what they wanted, and so did Charley. His first real job was that of robbing the Kroger Company Payroll Office where one of the women there described him as being "Just a mere boya pretty boy." The name stuck and from then on that is what the newspapers called him. His good looks didn't hurt with the ladies either and he ended up with both a wife and girlfriend clear up to the time of his death.
FBI Director J. Edgar Hoover had a personal vendetta against what he considered the scourge of the land and set his main Agent, Melvin Purvis to take down the most notorious of them, beginning with Johnny Dillinger who was ambushed outside the Biograph Theater in Chicago, thus moving Pretty Boy to the top of the list.