<Tr> <Th> Parent agency </Th> <Td> Department of Justice Office of the Director of National Intelligence </Td> </Tr> <Tr> <Th> Website </Th> <Td> fbi.gov </Td> </Tr> <P> The Federal Bureau of Investigation (FBI), formerly the Bureau of Investigation (BOI), is the domestic intelligence and security service of the United States, and its principal federal law enforcement agency . Operating under the jurisdiction of the U.S. Department of Justice, the FBI is also a member of the U.S. Intelligence Community and reports to both the Attorney General and the Director of National Intelligence . A leading U.S. counter-terrorism, counterintelligence, and criminal investigative organization, the FBI has jurisdiction over violations of more than 200 categories of federal crimes . </P> <P> Although many of the FBI's functions are unique, its activities in support of national security are comparable to those of the British MI5 and the Russian FSB . Unlike the Central Intelligence Agency (CIA), which has no law enforcement authority and is focused on intelligence collection overseas, the FBI is primarily a domestic agency, maintaining 56 field offices in major cities throughout the United States, and more than 400 resident agencies in lesser cities and areas across the nation . At an FBI field office, a senior - level FBI officer concurrently serves as the representative of the Director of National Intelligence . </P>

The fbi has jurisdiction over all federal and state laws