FRONTLINE

Room 641a

Clip: Season 2014 Episode 10 | 4m 3s

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: 05/19/08

Rating: NR

Problems Playing Video? | Closed Captioning

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 …

Un(re)solved

Multiplatform experience

Un(re)solved

"Un(re)solved" is a multiplatform experience telling the stories of lives cut short and examining a federal effort to investigate more than 150 cold cases that date back to the civil rights era.

Explore