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The fear that has a name -- how the Left enforces the party line. Worth quoting:

After all, these [Leftists] at the party were people with the equivalent of tenure, living in a free country with all sorts of protection of speech - not like the communist party or totalitarian racist South Africa in the old days. What were they afraid of? The fear, as I began to examine it, had two flavors. One was the same as the fear I had experienced in South Africa, in the communist party, in Hungary. It was fear for one's future, one's career. Even tenured faculty have lost their jobs and been disgraced because of an impolitic remark during the height of political correctness - I have known some of the hapless victims. One man, a friend whose health was poor, had been hounded, completely innocent, to his death by a whole conspiracy of gossip, secret caucuses and official administrative action.