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HONG KONG - 2013: In this handout photo provided by The Guardian, Edward Snowden speaks during an interview in Hong Kong. Snowden, a 29-year-old former technical assistant for the CIA, revealed details of top-secret surveillance conducted by the United States' National Security Agency regarding telecom data.  (Photo by The Guardian via Getty Images)
HONG KONG - 2013: In this handout photo provided by The Guardian, Edward Snowden speaks during an interview in Hong Kong. Snowden, a 29-year-old former technical assistant for the CIA, revealed details of top-secret surveillance conducted by the United States' National Security Agency regarding telecom data.  (Photo by The Guardian via Getty Images)

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Snowden: I did world a public service

A letter purportedly by Edward Snowden says that the NSA and Britain conduct the most surveillance without oversight.

Snowden: I did world a public service

A letter purportedly by Edward Snowden says that the NSA and Britain conduct the most surveillance without oversight.