G-Man is a slang

Slang

Slang is the use of informal words and expressions that are not considered standard in the speaker's language or dialect but are considered more acceptable when used socially. Slang is often to be found in areas of the lexicon that refer to things considered taboo...

 term for Special agent

Special agent

Special agent is usually the title for a detective or investigator for a state, county, municipal, federal or tribal government. An agent is a worker for any federal agency, and a secret agent is one who works for an intelligence agency....

s of the United States Government. It is specifically used as a term for a Federal Bureau of Investigation

Federal Bureau of Investigation

The Federal Bureau of Investigation is an agency of the United States Department of Justice that serves as both a federal criminal investigative body and an internal intelligence agency . The FBI has investigative jurisdiction over violations of more than 200 categories of federal crime...

 (FBI) agent.
In FBI mythology, the nickname

Nickname

A nickname is "a usually familiar or humorous but sometimes pointed or cruel name given to a person or place, as a supposedly appropriate replacement for or addition to the proper name.", or a name similar in origin and pronunciation from the original name....

 is held to have originated during the arrest of gangster George "Machine Gun" Kelly

Machine Gun Kelly

George Kelley Barnes , better known as "Machine Gun Kelly", was an American gangster during the prohibition era. His nickname came from his favorite weapon, a Thompson submachine gun. His most famous crime was the kidnapping of oil tycoon & businessman Charles Urschel in July 1933 for which he,...

 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

The FBI Story

The FBI Story is a 1959 American drama film produced and directed by Mervyn LeRoy. The screenplay by Richard L. Breen and John Twist is based on a book by Don Whitehead.-Plot:...

. The earliest cite in OED for the American usage is 1930 from a book on Al Capone

Al Capone

Alphonse Gabriel "Al" Capone was an American gangster who led a Prohibition-era crime syndicate. The Chicago Outfit, which subsequently became known as the "Capones", was dedicated to smuggling and bootlegging liquor, and other illegal activities such as prostitution, in Chicago from the early...

 by FD Pasley.

With the popularity of "Film Noir

Film noir

Film noir is a cinematic term used primarily to describe stylish Hollywood crime dramas, particularly those that emphasize cynical attitudes and sexual motivations. Hollywood's classic film noir period is generally regarded as extending from the early 1940s to the late 1950s...

" and gangster films during the 1940s and 50s, 'G-Men' became a popular slang term for the FBI.

See also

• FBI portrayal in media
• Gang Busters
  Gang Busters
  Gang Busters was an American dramatic radio program heralded as "the only national program that brings you authentic police case histories." It premiered as G-Men, sponsored by Chevrolet, on July 20, 1935.-History:...
  
   radio program originally called "G-Men" and developed in part by J. Edgar Hoover
  J. Edgar Hoover
  John Edgar Hoover was the first Director of the Federal Bureau of Investigation of the United States. Appointed director of the Bureau of Investigation—predecessor to the FBI—in 1924, he was instrumental in founding the FBI in 1935, where he remained director until his death in 1972...
  
  .
• Junior G-Men
  Junior G-Men
  Junior G-Men was an American boys club and popular culture phenomenon during the late 1930s and early 1940s that began with a radio program and culminated with films featuring the Dead End Kids.-Origins:...
  
  

External links

• Timeline of FBI History