The United States of Secrets

How did the government come to spy on millions of Americans? In United States of Secrets, FRONTLINE goes behind the headlines to reveal the dramatic inside story of the U.S. government's massive and controversial secret surveillance program -- and the lengths it went to try to keep it hidden from the public.

Just who is the NSA, what do they know, and how do they know it?

Did you ever feel like somebody's watching you?