"Terrorism, like viruses, is everywhere. There is a global perfusion of terrorism, which accompanies any system of domination as though it were its shadow, ready to activate itself anywhere, like a double agent."

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In order for the State in the person of school officials to justify prohibition of a particular expression of opinion, it must be able to show that its action was caused by something more than a mere desire to avoid the discomfort and unpleasantness that always accompany an unpopular viewpoint.

— Abe Fortas