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

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

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

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.

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 ...

Before Edward Snowden, Mark Klein blew the whistle on NSA internet spying. Best of CES 2025 Awards ➜ We may earn a commission ...

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

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 in the 2007 PBS Frontline episode "Spying on the Home Front" (left) and door revealed to be an NSA spying room at AT&T in the mid-2000s. Screnshots: PBS Mark Klein, the former AT&T ...

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