KnowraNational Security AgencyLinked fromLinked fromThe 10 pages that link to National Security Agency, each with the reason it gives.All 10Broader topic 1Related 6Narrower topic 2Compared with 1Venona projectNarrower topic: Venona’s classified records passed into the agency’s custody and were declassified in the 1990s.PRISM (surveillance program)Narrower topic: The NSA operates PRISM as part of its signals-intelligence mission.