NSA, Mark Klein and mass surveillance

AT&T technician Mark Klein, who exposed secret NSA spying, dies
Klein, a former AT&T technician turned whistleblower, exposed mass surveillance by the U.S. government in 2006.
Whistleblower Mark Klein, who brought NSA’s mass surveillance of Americans to light, dies at 79
Mark Klein, a whistleblower who exposed a National Security Agency program of mass government spying on American internet traffic in the 2000s, has died.
RIP Mark Klein. He exposed NSA's secret surveillance program in notorious Room 641A
The Electronic Frontier Foundation (EFF) recently announced the passing of Mark Klein, the AT&T whistleblower who exposed the NSA's mass surveillance program nearly two decades ago. Klein worked as a telecommunications technician at AT&T for 22 years when he discovered something alarming at the company's San Francisco facility: evidence of widespread government spying on American citizens.
Mark Klein, AT&T Whistleblower Who Exposed NSA’s Mass Surveillance, Dies at 79
Before Edward Snowden, Mark Klein blew the whistle on NSA internet spying. Best of CES 2025 Awards âžœ We may earn a commission when you buy through links on our sites. ©2025 GIZMODO USA LLC. All rights reserved.
Mark Klein has died
The unlikely hero who stood up to the government 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.
Mark Klein, AT&T technician who helped expose NSA spying, dies at 79
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.
Bay Area phone company technician who spotlighted NSA phone surveillance dies
Mark Klein, a former telecommunications technician for AT&T and a whistleblower, died in Oakland on Saturday at age 79 due to pancreatic cancer. Klein presented evidence from his work alleging that the National Security Agency was spying within the United States out of a secret room in the AT&T office on Folsom Street in San Francisco.
Wiring up Big Brother ... and fight: On the death of whistleblower Mark Klein
The US whistleblower Mark Klein is dead. He made it public for the first time that the NSA was also eavesdropping on US ...
RIP Mark Klein.
In 2006 the AT&T whistleblower exposed a secret room inside the company that routed network traffic to the NSA, leaking ...