United States. Federal Bureau of Investigation

The Federal Bureau of Investigation is the United States’ domestic intelligence and principal federal law enforcement agency. It was established in 1908 within the Department of Justice, and over time its work expanded far beyond early investigations to include national security, civil rights, violent crime, cybercrime, and public corruption.

The Bureau’s history is closely tied to major moments in modern American life. It became especially prominent during the long tenure of J. Edgar Hoover, who led the agency for decades and helped shape its national profile. That legacy is complicated: the FBI is known both for major investigative successes and for deeply controversial episodes involving surveillance, political overreach, and civil liberties abuses.

Today, the FBI presents itself as an organization focused on protecting the American people and upholding the Constitution. Its large public record, including official histories and released case files, makes it not only a law enforcement agency but also a frequent subject of public debate, journalism, and historical study.