According to Wikipedia,
Melvin Horace Purvis II was an American law enforcement official and Federal Bureau of Investigation agent. Given the nickname "Little Mel" because of his short, frame, Purvis became noted for leading the manhunts that captured or killed bank robbers such as Baby Face Nelson, John Dillinger, and Pretty Boy Floyd, but his high public profile was resented by local law enforcement. Purvis asserted he had killed Floyd single-handed, others variously claimed that Floyd had been already wounded, or even that Purvis had ordered Floyd summarily shot dead for refusing to provide information.
Melvin Purvis is affiliated with the following schools: