G-Man (slang) the Movie of the same name. G-Man (slang) G-Man (short for "Government Man") is an American slang term for special agents of the United States Government. It is specifically used as a term for a Federal Bureau of Investigation (FBI) agent. "G-Man" is also a term used for members of G Division, essentially a British anti-rebel police unit operating out of Dublin Castle prior to Irish Independence in 1922. Colonel Ned Broy uses the term in his official testimony for the Irish Army's Bureau of Military History in their archive of the Easter Rising (1916) and the Irish War of
G-Man (slang) Dictionary", its first known use in America was in 1928. The earliest citation in the "Oxford English Dictionary" for the American usage is 1930 from a book on Al Capone by FD Pasley. In FBI mythology, the nickname is held to have originated during the arrest of gangster George "Machine Gun" Kelly by agents of the Bureau of Investigation (BOI), a forerunner of the FBI, in September 1933. Finding himself unarmed, Kelly supposedly shouted, ""Don't shoot, G-Men! Don't shoot, G-Men!"" This event is dramatized in the 1959 film "The FBI Story" and this dramatization is referenced in the 2011 film