J. Edgar Hoover, FBI director from 1924 to 1972
The "suicide letter", mailed anonymously to King by the FBI
An FBI surveillance photograph of Joseph D. Pistone (aka Donnie Brasco), Benjamin "Lefty" Ruggiero and Edgar Robb (aka Tony Rossi), 1980s
FBI SWAT agents in a training exercise
An FBI agent tags the cockpit voice recorder from EgyptAir Flight 990 on the deck of the USS Grapple (ARS 53) at the crash site on November 13, 1999.
September 11 attacks at the Pentagon
FBI field divisions map
Organization chart for the FBI as of July 15, 2014
An FBI agent at a crime scene
FBI badge and service pistol, a Glock Model 22, .40 S&W caliber
FBI Director James Comey visiting the Fort Berthold Indian Reservation in North Dakota in June 2016.
The J. Edgar Hoover Building, FBI Headquarters
FBI Mobile Command Center, Washington Field Office
The FBI Academy, located in Quantico, Virginia
The FBI Field Office in Chelsea, Massachusetts
An FBI Evidence Response Team
Agents in training on the FBI Academy firing range
A Glock 22 pistol in .40 S&W caliber
Publication following the 2021 United States Capitol attack
The popular TV series The X-Files depicts the fictional FBI Special Agents Dana Scully (Gillian Anderson) and Fox Mulder (David Duchovny) who investigate paranormal phenomena.

Melvin Horace Purvis II (October 24, 1903 – February 29, 1960) was an American law enforcement official and Federal Bureau of Investigation (FBI) agent.

- Melvin Purvis

Melvin Purvis

- Federal Bureau of Investigation

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John Dillinger

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American gangster during the Great Depression.

American gangster during the Great Depression.

Display of newspaper clippings of the capture of John Dillinger and his gang in the old lobby of the Congress Hotel.
The John Dillinger House in Tucson, Arizona
The crowd at Chicago's Biograph Theater on July 22, 1934, shortly after Dillinger was killed there by FBI agents.
FBI photograph of the Biograph Theater taken July 28, 1934, six days after the shooting, the only night Murder in Trinidad played
A Dillinger death mask made from an original mold, one of four made. A second is on display at the Alcatraz East museum in Pigeon Forge, TN. Note the bullet exit mark below the right eye.
Grave at Crown Hill Cemetery, Indianapolis, Indiana – at least the fourth marker to be replaced since 1934, due to souvenir seekers chipping away at them.
Homer Van Meter
John Hamilton
Charles Makley
Eddie Green
Lester Joseph Gillis ("Baby Face Nelson")

In response, J. Edgar Hoover, director of the Bureau of Investigation (BOI), used Dillinger as a campaign platform to evolve the BOI into the Federal Bureau of Investigation, developing more sophisticated investigative techniques as weapons against organized crime.

Special Agent in Charge Melvin Purvis and several BOI agents approached the lodge when three men exited the building and began to drive off.

Hoover in 1961

J. Edgar Hoover

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American law enforcement administrator who served as the first Director of the Federal Bureau of Investigation (FBI) of the United States.

American law enforcement administrator who served as the first Director of the Federal Bureau of Investigation (FBI) of the United States.

Hoover in 1961
Dickerson Naylor Hoover
Hoover in 1932
Hoover in 1940
Hoover investigated ex-Beatle John Lennon by putting the singer under surveillance, and Hoover wrote this letter to Richard Kleindienst, the US Attorney General in 1972. A 25-year battle by historian Jon Wiener under the Freedom of Information Act eventually resulted in the release of documents like this one.
Hoover photographed in 1959
July 24, 1967. President Lyndon B. Johnson (seated, foreground) confers with (background L-R): Marvin Watson, J. Edgar Hoover, Sec. Robert McNamara, Gen. Harold Keith Johnson, Joe Califano, Sec. of the Army Stanley Rogers Resor, on responding to the Detroit riots
President Lyndon B. Johnson at the signing of the Civil Rights Act of 1964. White House East Room. People watching include Attorney General Robert F. Kennedy, Senate Minority Leader Everett M. Dirksen, Senator Hubert Humphrey, First Lady "Lady Bird" Johnson, Rev. Martin Luther King Jr., F.B.I. Director J. Edgar Hoover, Speaker of the House John McCormack. Television cameras are broadcasting the ceremony.
FBI Headquarters in Washington, DC
Hoover with Bebe Rebozo (left) and Richard Nixon. The three men relax before dinner, Key Biscayne, Florida, December 1971.
Hoover and his assistant Clyde Tolson sitting in beach lounge chairs, c. 1939

He was appointed director of the Bureau of Investigation – the FBI's predecessor – in 1924 and was instrumental in founding the FBI in 1935, where he remained director for another 37 years until his death in 1972 at the age of 77.

Melvin Purvis was a prime example: Purvis was one of the most effective agents in capturing and breaking up 1930s gangs, and it is alleged that Hoover maneuvered him out of the Bureau because he was envious of the substantial public recognition Purvis received.

Lester Joseph Gillis

Baby Face Nelson

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American bank robber who became a criminal partner of John Dillinger, when he helped Dillinger escape from prison, in Crown Point, Indiana.

American bank robber who became a criminal partner of John Dillinger, when he helped Dillinger escape from prison, in Crown Point, Indiana.

Lester Joseph Gillis
A plaque at the Barrington Park District in Barrington, Illinois, commemorates the lives of the three FBI agents killed by Nelson

A violent bank robber, Lester Joseph Gillis killed more agents of the FBI than has any other criminal.

Melvin Purvis and a number of agents arrived by plane from Chicago, and with the gang's departure imminent, attacked the lodge quickly and with little preparation, and without notifying or obtaining help from local authorities.