Who funded the 9/11 hijackers? How did they go through the United States without being detected by the FBI? Were any of them actually recruited by the CIA? On this episode of the Whistleblowers, John Kiriakou gets to the bottom of these questions and more with investigative journalist, Kit Klarenberg, whose research with Greyzone UK he has uncovered some uncomfortable truths and connections between the 9/11 hijackers, an FBI informant, and the CIA.