Mark Klein

Klein in 2006 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. The subsequent media coverage became a major story in May 2006. Provided by Wikipedia
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