The fact is that censorship always defeats its own purpose, for it creates, in the end, the kind of society that is incapable of exercising real discretion,… In the long run it will create a generation incapable of appreciating the difference between independence of thought and subservience.

Who among American heroes could meet their tests, who would be cleared by their committees? Not Washington, who was a rebel. Not Jefferson, who wrote that all men are created equal and whose motto was "rebellion to tyrants is obedience to God." Not Garrison, who publicly burned the Constitution; or Wendell Phillips, who spoke for the underprivileged everywhere and counted himself a philosophical anarchist; not Seward of the Higher Law or Sumner of racial equality. Not Lincoln, who admonished us to have malice toward none, charity for all; or Wilson, who warned that our flag was "a flag of liberty of opinion as well as of political liberty"; or Justice Holmes, who said that our Constitution is an experiment and that while that experiment is being made "we should be eternally vigilant against attempts to check the expression of opinions that we loathe and believe to be fraught with death."

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The search for subversives results in the intimidation of the independent, the original, the imaginative, and the experimental-minded… It discourages the discussion of controversial matters in the classroom, for such discussion may be reported, or misreported, and cause trouble.

With the Sedition and Espionage Acts … the "red hysteria" of the Twenties, the Alien Registration Act of 1940, the loyalty tests and purges of the mid-Forties, the establishment of un-American Activities Committees, intolerance received, as it were, the stamp of official approval. Loyalty was identified with conformity, and the American genius, which had been experimental and even rebellious, was required to conform to a pattern.

Uncertain of principles, we fall back on emotion; unfamiliar with the past, we are afraid of the future. Increasingly we look to men, ideas, and institutions not from the point of view of how they work, but from the point of view of how they ought to work…