FromPBSandFrontline:LastyearEdwardSnowdendownloadedtensofthousandsoftop-secretdocumentsfromahighlysecuregovernmentcomputernetwork.TherevelationsthatfollowedtouchedoffafiercedebateoverthemassivesurveillanceoperationsconductedbytheNationalSecurityAgency.NowFRONTLINEinvestigatesthesecrethistoryoftheunprecedentedsurveillanceprogra...
8.3分
7.6分
6.4分
8.8分
9.0分
7.0分
8.0分
7.9分
9.3分
7.8分
7.3分
7.9分