What happens when a state tries to purge its state universities or a community tries to purge its public schools of alleged subversives? […] What happens is the demoralization and eventual corruption of the school system. This is not a momentary or even temporary affair; it is something the consequences of which may be felt for years. The search for subversives results in the intimidation of the independent, the original, the imaginative, and the experimental-minded. It discourages independence of thought in teachers and students alike. It discourages the reading of books that may excite the suspicion of some investigator or some Legionnaire. It discourages the discussion of controversial matters in the classroom, for such discussion may be reported, or misreported, and cause trouble. It creates a situation where first-rate minds will not go into teaching or into administration and where students therefore get poor teaching. In the long run it will create a generation incapable of appreciating the difference between independence of thought and subservience. In the long run it will create a generation not only deprived of liberty but incapable of enjoying liberty.

Henry Steele Commager (1902-1998) American historian, writer, activist
Freedom, Loyalty, Dissent, “Free Enterprise in Ideas” (1954)
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Originally published in the Saturday Review (1952), based on a speech to the Advertising Council's American Round Table, New York City (1951).