‘Gold, mister, is worth what it is because of the human labor that goes into the finding and getting of it.” It’s a line spoken by Walter Huston in the 1948 film The Treasure of the Sierra Madre, a story about greed and moral corruption directed by his son, John Huston. That line was to have appeared on screen at the beginning of the film. It didn’t, on orders from the studio, Warner Bros. “It was all on account of the word ‘labor’,” John Huston later reflected. “That word looks dangerous in print, I guess.”

It was a relatively insignificant moment in the drama of America’s postwar red scare. McCarthyism proper had still to take flight. Yet, so deep ran the fear already that a single, everyday word could create consternation in Hollywood.

McCarthyism, the historian Ellen Schrecker has observed, “was a peculiarly American style of repression – nonviolent and consensual. Only two people were killed; only a few hundred went to jail.” Yet it constituted “one of the most severe episodes of political repression the United States ever experienced”.

Sackings and legal sanctions created such fear that, in the words of the political philosopher Corey Robin, society was put “on lockdown”, with people so “petrified of being punished for their political beliefs” that “they drew in their political limbs”.

It was not just communists who were silenced. “If someone insists that there is discrimination against Negroes in this country, or that there is an inequality of wealth,” claimed the chair of one state committee on un-American activities, “there is every reason to believe that person is a communist.” This at a time when Jim Crow still held the south in its grip. The red scare paused the civil rights movement for more than a decade and drew the teeth of union radicalism.

Fear has always been a means of enforcing social order, most obviously in authoritarian states, from China to Saudi Arabia, Turkey to Russia, where repression becomes the foundation of political rule. In liberal democracies, order rests more on consensus than overt brutality. But here, too, fear plays its role. The worker’s fear of being sacked, the claimant’s of........

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