Part One
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.
Part Two
FRONTLINE continues the dramatic inside story of mass surveillance in America with Part Two of United States of Secrets, an investigation into the hidden relationship between Silicon Valley and the National Security Agency.