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Mark Klein

The Whistleblowers Who Challenged Mass Surveillance After 9/11

Mark Klein worked for over twenty years as a technician for the AT&T Corporation. He blew the whistle on the AT&T’s collaboration with the National Security Agency, which allowed for warrantless wiretapping of phone and internet communications. In 2006, Klein came to the Electronic Frontier Foundation (EFF) with documents of AT&T’s involvement in the United States’ domestic spying program. His whistleblowing became the basis of the organization’s lawsuit against the NSA. According to Kevin Bankston [PDF], who was an EFF staff attorney, Klein described the “technology behind AT&T’s participation in the program, whereby the NSA had been given complete access  to  the  Internet  traffic  transiting  through  at  least  one,  and  probably  more,  AT&T  Internet  facilities.”
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