Federal Bureau of Investigation

The FBI, formally the Federal Bureau of Investigation, was an American governmental department that conducted criminal investigations.

History
When Ryan was caught by Rosa Parks for following her, Rosa asked how she'd know he wasn't working for the FBI or the police. According to Ryan, if he was, he'd be better at sneaking up on her, not have a British accent and not be dark-skinned. (TV: Rosa)

The FBI investigated the assassination of President John F. Kennedy, including agent Warren Skeet, who was one of the individuals affected by the Shroud. (PROSE: Shroud of Sorrow)

FBI agent Joe Manco once interrogated Ace, but she used the Seventh Doctor's CIA connections to convince him that they were on the same side. (PROSE: First Frontier)

In 1969, Richard Nixon hired former FBI agent Canton Everett Delaware III to investigate mysterious telephone calls he was receiving. He chose him based on his FBI training. (TV: The Impossible Astronaut)

During the 1980s, two FBI agents were sent to the Antarctic after two Americans tried to kill each other at a base there. (AUDIO: Snow Blind)

The Doctor once carried an FBI badge. (PROSE: Atom Bomb Blues)

The FBI prevented a group of cyber-terrorists from using the Armageddon virus to bring down the international banking network. (TV: The Lost Boy)

Delphi once changed the FBI records to suit her plans. (PROSE: Beautiful Chaos)

In 2011, Jack Harkness posed as a member of the FBI to gain entry to a medical experiment related to Miracle Day. (TV: The New World)

By one account, Diana Goddard was an undercover FBI agent during her time working for Henry van Statten. (PROSE: Dalek)