Former NSA whistle-blower Edward Snowden revealed the massive US global surveillance program.
A US intelligence agency formally requested a criminal probe on Saturday into the leak of highly classified information about secret surveillance programs.
A US intelligence agency formally requested a criminal probe on Saturday into the leak of highly classified information about secret surveillance programs.
The classified phone and internet surveillance programs, which sparked controversy in the recent week, have prevented dozens of terrorist plots.
The classified phone and internet surveillance programs, which sparked controversy in the recent week, have prevented dozens of terrorist plots.
The American Civil Liberties Union sued senior US government officials on Tuesday to strike down the National Security Agency's telephone surveillance.
Three of the largest US Internet companies called on the US government to provide greater transparency on national security requests on Tuesday.
US President Barack Obama on Friday defended the government's phone and Internet surveillance program, stressing that the tracking of internet activity has not applied to US citizens.
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