“The government is the potent omnipresent teacher. For good or ill it teaches the whole people by its example. Crime is contagious. If the government becomes a lawbreaker, it breeds contempt for law; it invites every man to become a law unto himself; it invites anarchy. To declare that the end justifies the means -- to declare that the government may commit crimes -- would bring terrible retribution.”
-- Justice Louis D. Brandeis, 1856 - 1941.