Subject(s): United States. -- National Security Agency/Central Security Service. | Electronic surveillance -- Government policy -- United States. | Electronic intelligence -- Government policy -- United States. | Government information -- Access control -- United States. | Data protection -- Government policy -- United States. | Security classification (Government documents) -- United States. | Security clearances -- United States. | Leaks (Disclosure of information) -- United States. | Particular activities of public administrationIncluding: Public administration of the economy. Cultural administration Application Note: Details by colon combination