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Definition of G-man
1. Noun. A special law-enforcement agent of the Federal Bureau of Investigation.
Definition of G-man
1. Noun. (historical) A US government agent fighting organized crime in the interwar years. ¹
2. Noun. A fictional character based on this definition, eg, Dick Tracy. ¹
3. Noun. Any person working for the US Government, especially in undercover work. ¹
¹ Source: wiktionary.com