G-Man (slang) 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 Independence (1919-1921). According to the "Merriam-Webster
Robert G. Gillespie Robert G. Gillespie Robert G. Gillespie (1903 – January 31, 1983) was an FBI agent who participated in the capture of bank robber John Dillinger, and who later became a justice of the Mississippi Supreme Court. Born in Madison, Alabama, Gillespie was raised in Mississippi. He briefly attended the University of Alabama Law School, but was unable to afford the program, instead dropping out and reading law to be admitted to practice in Mississippi, in 1927. He spent less than a year in the FBI, from 1934–1935, but during that time he participated in the ambush leading to the death