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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.

Behind the door of the now-infamous Room 641A, optical splitting wiretaps were creating an identical copy of raw internet traffic and funneling it back to the NSA. Klein’s disclosure was confirmation that the U.S. government was accessing the internet data on millions of Americans using powers granted by Congress in the aftermath of the September 11, 2001 terrorist attacks. In 2013, then-NSA contractor Edward Snowden leaked thousands of classified documents to journalists detailing widescale NSA surveillance around the world.

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