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FRONTLINE

Room 641a

AT&T technician Mark Klein makes a surprising discovery.

Aired 05/19/2008 | Rating NR

FRONTLINE

Room 641a

Clip: Season 2014 Episode 10 | 4m 3s

AT&T technician Mark Klein makes a surprising discovery.

When an NSA agent showed up at AT&T headquarters, technician Mark Klein didn't think much of it. But later, he noticed a secret room — and uncovered an infrastructure suggesting that the government was copying all traffic going through AT&T's Internet backbone. FRONTLINE's "United States of Secrets: Privacy Lost" premieres Tuesday, May 20 at 10 p.m. on PBS.

Aired 05/19/2008 | Rating NR

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Funding for FRONTLINE is provided through the support of PBS viewers and by the Corporation for Public Broadcasting. Major funding for FRONTLINE is provided by the Ford Foundation. Additional funding...

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Clip: S2014 Ep10 | 5m | Nick Merrill receives a highly secretive data request from the FBI. (5m)

“United States of Secrets” - Trailer

Preview: S2014 Ep10 | 2m 56s | How did the government come to spy on millions of Americans? (2m 56s)

“United States of Secrets (Part Two)” - Trailer

Clip: S2014 Ep10 | 31s | How did the government come to spy on millions of Americans? (31s)

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Clip: S2014 Ep10 | 50s | Security expert Bruce Schneier explains some of the NSA's surveillance devices. (50s)

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Funding for FRONTLINE is provided through the support of PBS viewers and by the Corporation for Public Broadcasting. Major funding for FRONTLINE is provided by the Ford Foundation. Additional funding...

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