The Electronic Frontier Foundation (EFF) recently announced the passing of Mark Klein, the AT&T whistleblower who exposed the ...

Mark Klein, the former AT&T engineer who exposed the NSA’s extensive domestic spying program, passed away on March 8 at his home in Oakland, California, after battling prostate cancer. He was 79 years ...

With him he carried schematics exposing the largest US government domestic spying operation since Watergate.… That person was ...

The unlikely hero who stood up to the government Mark Klein, the AT&T technician who blew the whistle on one of the most ...

In 2006, he shared corporate documents showing how the National Security Agency was accessing internet data through a secret room in an AT&T office building.

Klein, a former AT&T technician turned whistleblower, exposed mass surveillance by the U.S. government in 2006.

In 2006 the AT&T whistleblower exposed a secret room inside the company that routed network traffic to the NSA, leaking ...

Mark Klein, the former AT&T employee who helped expose the fact that the National Security Agency was spying on vast amounts of internet traffic in the U.S. during the mid-2000s, has died, according ...