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Part One

Episode number: 1

Overview: How did the government come to spy on millions of Americans? FRONTLINE goes behind the headlines to reveal the dramatic inside story of the U.S. government's massive and controversial secret surveillance program.

Part Two

Episode number: 2

Overview: 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.