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History Facts & Stories on Instagram: "In 2006, former AT&T technician Mark Klein discovered a door with no handle, labeled “Room 641A,” inside an AT&T data center in San Francisco. Behind it was a highly classified space known as the SG3 Secure Room — operated in partnership with the NSA. Inside, Klein learned, was a fiber optic splitter that duplicated all internet traffic passing through the building. This allowed the NSA to monitor emails, web activity, and messages - not just international
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