Before revision: The existence of Tempora was revealed by Edward Snowden, a former American intelligence contractor who leaked information about the program to former The Guardian journalist Glenn Greenwald in May 2013 as part of his revelations of government-sponsored mass surveillance programs.
After revision: existence of Tempora was revealed by Edward Snowden, a former American intelligence contractor who leaked information about the program to former The Guardian journalist Glenn Greenwald in May 2013 as part of his revelations of government-sponsored mass surveillance programs.