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As gangster Machine Gun Kelly surrenders to the FBI, he shouts out, "Don't shoot, G-Men!", which becomes a nickname for FBI agents.
Related Wikipedia articles
Machine Gun Kelly (gangster)
American gangster (1895–1954)
George Kelly Barnes, better known by his nickname Machine Gun Kelly, was an American gangster from Memphis, Tennessee, active during the Prohibition era. His nickname came from his favorite weapon, a Thompson submachine gun. He is best known for the kidnapping of oil tycoon and…Source: Wikipedia (CC BY-SA)
G-man
American slang term for federal agents
G-man is an American slang term for agents of the United States Government. It is especially used as a term for an agent of the Federal Bureau of Investigation (FBI).Source: Wikipedia (CC BY-SA)