Improve Your Vocabulary for Greater World Power!
national censorship—The examination and control under civil authority of communications entering, leaving, or transiting the borders of the United States, its territories, or its possessions. See also censorship.—page 355, Joint Publication 1-02, Department of Defense Dictionary of Military and Associated Terms
(A tip of the cap to Steven Aftergood of the Federation of American Scientists for posting the recently revised Department of Defense official dictionary. Check out the invaluable FAS Project on Government Secrecy.)