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
The Man Called X created by Jay Richard Kennedy who later adapted "The Man Called X" to a 39-episode syndicated television series (1956–57) starring Barry Sullivan as Thurston for Ziv Television. The Man Called X The Man Called X is an espionage radio drama that aired on CBS and NBC from July 10, 1944, to May 20, 1952. Herbert Marshall had the lead role of agent Ken Thurston/"Mr. X" who took on dangerous cases in a variety of exotic locations. Leon Belasco played Mr. X's comedic sidekick, Pegon Zellschmidt, who always turned up in remote parts of the world because he had a "cousin"