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Mark Klein - Wikipedia Mark Lee Klein (May 2, 1945 – March 8, 2025) was an American AT T technician and whistleblower who revealed details of the company's cooperation with the United States National Security Agency in installing network hardware at a site known as Room 641A to monitor, capture and process American telecommunications
In Memoriam: Mark Klein, AT T Whistleblower Who Revealed NSA Mass . . . EFF is deeply saddened to learn of the passing of Mark Klein, a bona fide hero who risked civil liability and criminal prosecution to help expose a massive spying program that violated the rights of millions of Americans Mark didn’t set out to change the world
RIP Mark Klein, the engineer who exposed US domestic spying That person was Mark Klein, who died on March 8 this year from cancer He was 79 After a life working in telecoms, Klein realized he had helped the NSA wire up a listening station in AT T's San Francisco switching facility - the infamous Room 641A - that was being used to illegally spy on Americans
AT T technician Mark Klein, who exposed secret NSA spying, dies 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