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

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 ...

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.

TechCrunch · Image Credits:Mark Klein / Wikimedia Commons (opens in a new window) under a CC BY-SA 3.0 (opens in a new window) license. Mark Klein, a former AT&T technician turned whistleblower ...

Mark Klein, the AT&T technician who blew the whistle on one of the most extensive illegal surveillance operations in American history, has died. He was 79. He was an unlikely hero. For more than ...

Before Edward Snowden, Mark Klein blew the whistle on NSA internet spying. Best of CES 2025 Awards We may earn a commission when you buy through links on our sites. ©2025 GIZMODO USA LLC.

Mark Klein, a whistleblower who exposed a National Security Agency program of mass government spying on American internet traffic in the 2000s, has died. He was 79 years old. His brother ...

TechCrunch · Image Credits:Mark Klein / Wikimedia Commons (opens in a new window) under a CC BY-SA 3.0 (opens in a new window) license. Mark Klein, a former AT&T technician turned whistleblower who ...

The US whistleblower Mark Klein is dead. He made it public for the first time that the NSA was also eavesdropping on US citizens. It has now been announced that the US whistleblower Mark Klein has ...