Nova - S36E02 - The Spy Factory

Examine the high-tech eavesdropping carried out by the National Security Agency and the pitfalls of surveillance in an age of terrorism. The National Security Agency, or NSA, is the largest, most secret, most technologically advanced intelligence agency in the world. It thrived during the Cold War with the Soviets, but Al Qaeda represents an entirely different kind of threat. Is the NSA up to it?