Author Glenn Greenwald 's new book shows that NSA spies on many embassies . Bruce Schneier : Spying on foreign governments is what the NSA is supposed to do . He says what is dangerous is the NSA spying on entire populations . The New York Times reports today about a secret program called PRISM, which was revealed by Edward Snowden in 2013 and has been described as an "electronic surveillance empire" run by the NSA.
Author Glenn Greenwald 's new book shows that NSA spies on many embassies . Bruce Schneier : Spying on foreign governments is what the NSA is supposed to do . He says what is dangerous is the NSA spying on entire populations . Schneier : We must separate espionage , a military mission , from broad surveillance .