PBS peeks inside NSA

UNIVERSAL CITY, Calif. — The National Security Agency is the largest intelligence-gathering organization in the world, three times the size of the CIA. And, as it turns out, the NSA eavesdropped on the terrorists who plotted the 9/11 attacks — and never turned that information over to the FBI, the CIA or anyone else.

That's the conclusion of "NOVA: The Spy Factory" (7 p.m., PBS/Ch. 7, which seeks to understand how that could possibly have happened.

"That's the question we pose in the program, because NSA has not answered that question, and the 9/11 Commission never bothered to look into it," said James Bamford, author of "The Shadow Factory: The Ultra-Secret NSA from 9/11 to the Eavesdropping on America."

As it turns out, the NSA was eavesdropping on terrorists Kahlid al-Midar and Nawaf Al Hamzi for years in both Yemen and the United States.

"The question was — why didn't NSA pass that information on?" Bamford said. "And one possible reason is that the head of NSA at the time, Gen. Michael Hayden, had to worry about being called before the Senate and asked to explain why he's eavesdropping on Americans. The problem is, he could have eavesdropped on these terrorists in the United States without ever coming into any type of trouble, because he could have gotten a warrant from the foreign intelligence surveillance court to do it. That's why it was set up that way.

"So again, that's the question we pose. And I, as well as a lot of people in Washington and around the country, would like to get that answered."

"The Spy Factory" offers theories but no concrete answers. However, it offers a look inside the super-secret NSA unlike anything we've seen on television before.

Not all the information is new. Adrienne Kinne, a former voice interceptor and Arab linguist for the NSA, has been on "60 Minutes" charging that the agency overstepped its bounds — charges she repeats on "NOVA."

Kinne said that, after she left the NSA, she saw reports in the media about domestic wiretapping indicating that "if you're a law-abiding American, you don't have to worry about being spied upon. And … I knew that not to be true."