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a photo of the exterior of Room 641A, which has a yellow door without a door handle, in a dimly lit datacenter in a San Francisco AT&T hub.

Image Credits:Mark Klein /Wikimedia Commons(opens in a new window)under aCC BY-SA 3.0(opens in a new window)license.

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Mark Klein , a former AT&T technician turned whistle blower who queer aggregated surveillance by the U.S. political science , has died at historic period 79 .

Klein run public in 2006 with document revealing that the NSA was using a underground elbow room in an AT&T hub in San Francisco to tap into the backbone of the cyberspace .

Behind the doorway of the now - infamousRoom 641A , optic splitting wiretaps were creating an identical copy of natural internet dealings and funneling it back to the NSA .

Klein ’s disclosure was check that the U.S. government was accessing the net information 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 leak thousand of classified documents to diarist detailing widescale NSA surveillance around the reality .

Klein ’s expiry wasconfirmed by the Electronic Frontier Foundation , the San Francisco - based digital rights grouping who Klein turned to , and which go on to sue the federal governance following Klein ’s disclosures . The case was finally dismiss .

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