Columbia subject headings:
Harvard subject headings:
Civil rights--United States
Electronic intelligence--United States.
Electronic surveillance--Government policy--United States.
National security--United States
Privacy, Right of--United States
Snowden, Edward J., 1983-
Terrorism--United States--Prevention
United States. National Security Agency--Rules and practice.
Princeton subject headings:
Computer crimes--United States--Prevention.
Electronic surveillance--United States.
Internet in espionage--United States.
Leaks (Disclosure of information)--a United States.
Snowden, Edward J., 1983-