Mark Klein, a retired AT&T communications technician, revealed in 2006 that his job duties included connecting internet circuits to a splitting cabinet that led to a secret room in AT&T's San Francisco office.
During the course of that work, he learned from a co-worker that similar cabins were being installed in other cities, including Seattle, San Jose, Los Angeles and San Diego, he said.
That's how the data was being vacuumed to the government, Klein said today.
"This is a complete vindication," Klein, a San Francisco Bay area retired man, said in a telephone interview.
Attendees break for lunch during the 2012 Republican Convention in Tampa, Fla. on Tuesday, Aug. 28, 2012.
Klein's documents were lodged under seal in an Electronic Frontier Foundation lawsuit accusing the government of siphoning Americans' communications to the NSA.
"This is exactly what we've been arguing in court for years," Trevor Timm, an EFF digital-rights analyst, said in a telephone interview. »