简介：FromPBSandFrontline:LastyearEdwardSnowdendownloadedtensofthousandsoftop-secretdocumentsfromahighlysecuregovernmentcomputernetwork.TherevelationsthatfollowedtouchedoffafiercedebateoverthemassivesurveillanceoperationsconductedbytheNationalSecurityAgency.NowFRONTLINEinvestigatesthesecrethistoryoftheunprecedentedsurveillanceprogramthatbeganinthewakeofSeptember11thandcontinuestoday.Throughexclusiveinterviewswithintelligenceinsiders,cabinetofficials,andgovernmentwhistle-blowers,PartOnerevealshowtheU.S.governmentcametomonitorthecommunicationsofmillionsofAmericansandtocollectbillionsofrecordsonordinarypeoplearoundtheworld.　　WrittenbyAnonymous.…