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http://en.wikipedia.org/wiki/G-Man_(slang)"...
G-Man (short for
Government
Man) is
slang for a
Federal Bureau of Investigation (FBI) agent. The word "Government" stands for the
United States Federal Government, as opposed to state or local government police agencies."...
In FBI mythology, the nickname is held to have originated during the arrest of gangster George "Machine Gun" Kelly
by agents of the Division of Investigation (DOI), a forerunner of the
FBI, in September 1933. Finding himself unarmed, Kelly supposedly
shouted "Don't shoot, G-Men! Don't shoot, G-Men!"[1] This event is dramatized in the 1959 film, The FBI Story, where its somewhat implausible quality is in no way diminished.
With the popularity of Film Noir and gangster films during the 1940s
and 50s, 'G-Men' became a popular slang term for the police.
The term "G-Man" was also used at least as far back as 1916 in Ireland as a reference to the detectives of the Dublin Metropolitan Police force's "G" Division, whose job it was to collect information on the various revolutionaries within the city.[2]"
