Columbia subject headings:
Civil rights--United States.
National security--United States.
September 11 Terrorist Attacks, 2001.
Terrorism--United States--Prevention.
Harvard subject headings:
Civil rights--United States--Cases
National security--Law and legislation--United States--Cases.
Terrorism--United States--Cases.
Princeton subject headings:
Civil rights--United States--Cases.
National security--Law and legislation--United States--Cases.
Terrorism--United States--Cases.