"Machine Gun" George Kelly was one of the most infamous criminals of the Great Depression.
On July 12, 1933, Kelly launched one of his most brazen crimes when he drove up to the home of Charles F. Urschel, one of the richest men in Oklahoma at the time. Urschel, who'd made his fortune in oil, was playing a game of bridge with his wife and another couple.
According to the FBI's recap of the case, Kelly and accomplices accosted the group and kidnapped the oil tycoon and his friend Walter Jarrett after they refused to reveal which one of them was, in fact, Urschel.
The Kelly gang let Jarrett go after checking Urschel's wallet. A few weeks later, on July 30, Urschel was also released after his family paid a $200,000 ransom.
Urschel had been blindfolded for much of the ordeal, but he was able to give the FBI crucial details about the gang's hideout.
As the investigation heated up, Kelly and his wife Kathryn began sending the Urschel family threatening notes, but the FBI ultiamtely captured the couple on September 26 in Memphis.