Mark Klein

Mark Klein

American whistleblower (1945–2025)

📍 New York City, New York USA

Public Career & Background Dossier

Mark Lee Klein 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.

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