Federal Bureau of Investigation

United States' domestic intelligence and security service, as well as the country's primary federal law enforcement organisation, is known as the Federal Bureau of Investigation (FBI). In addition to being a member of the United States Intelligence Community and reporting to both the Attorney General and the Director of National Intelligence, the FBI is a federal law enforcement agency that falls under the authority of the United States Department of Justice. It is the FBI's authority to investigate breaches of more than 200 types of federal offences, making it a major counter-terrorism, counterintelligence, and criminal investigation agency in the United States.

Despite the fact that the FBI performs numerous tasks that are unique to it, its operations in support of national security are similar to those of the British MI5 and the Russian FSB in terms of scope and sophistication. The FBI, in contrast to the Central Intelligence Agency (CIA), which has no law enforcement authority and is primarily focused on intelligence collection abroad, is primarily a domestic agency, with 56 field offices in major cities throughout the United States and more than 400 resident agencies in smaller cities and areas throughout the United States. When a senior-level FBI officer is assigned to a field office, he or she also acts as the Director of National Intelligence's representative in the office.

The Bureau of Investigation, often known as the BOI or BI for short, was founded in 1908 and was originally known as the Bureau of Investigation. The Federal Bureau of Investigation (FBI) was established in 1935 when the organization's name was changed. The J. Edgar Hoover Building, which houses the FBI's headquarters, is situated in Washington, D.C.