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

In 2006, a retired AT&T engineer knocked on the door of the EFF's office in a rundown part of San Francisco's Mission ...

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 ...

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

The US whistleblower Mark Klein is dead. He made it public for the first time that the NSA was also eavesdropping on US ...

Mark Klein, a whistleblower who exposed a National Security Agency program of mass government spying on American internet ...

Mark Klein, a former AT&T technician turned whistleblower who exposed mass surveillance by the U.S. government, has died at age 79. Klein went public in 2006 with documents revealing that the NSA ...

Behind the door of the now-infamous Room 641A, optical splitting wiretaps were creating an identical copy of raw internet traffic and funneling it back to the NSA. Klein's disclosure was ...