George "Machine Gun" Kelly (1895-1954) was a notorious American gangster during the prohibition era.

His crimes included bootlegging, armed robbery and kidnapping. The last crime activity proved disasterous when he kidnapped Charles Urschel who made sure to foil his kidnappers by noting every possible evidence of his experience such as carefully noting background sounds, counting footsteps and leaving fingerprints on every surface in reach. This in turn proved invaluable for the FBI in their investigation.