This is a great documentary that explores the role of the NSA in America with a strong focus on the NSA's actions in regard to 9/11.
This is the documentary that has actual testimony from the FBI agent that had been contracted out to the NSA who had been following the hijackers.
The FBI agent speaks about how he was ORDERED TO STAND DOWN when he wished to alert his superiors.
The full documentary can be watched on PBS's website here
Downloaded via torrent here
>>PREVIEW CLIP<<YouTube - NOVA | The Spy Factory | PBS