As I watched “The Crucible” taking shape as a movie over much of the past year, the sheer depth of time that it represents for me kept returning to mind. As those powerful actors blossomed on the screen, and the children and the horses, the crowds and the wagons, I thought again about how I came to cook all this up nearly fifty years ago, in an America almost nobody I know seems to remember clearly. In a way, there is a biting irony in this film’s having been made by a Hollywood studio, something unimaginable in the fifties. But there they are—Daniel Day-Lewis (John Proctor) scything his sea-bordered field, Joan Allen (Elizabeth) lying pregnant in the frigid jail, Winona Ryder (Abigail) stealing her minister-uncle’s money, majestic Paul Scofield (Judge Danforth) and his righteous empathy with the Devil-possessed children, and all of them looking as inevitable as rain.

I remember those years—they formed “The Crucible” ’s skeleton—but I have lost the dead weight of the fear I had then. Fear doesn’t travel well; just as it can warp judgment, its absence can diminish memory’s truth. What terrifies one generation is likely to bring only a puzzled smile to the next. I remember how in 1964, only twenty years after the war, Harold Clurman, the director of “Incident at Vichy,” showed the cast a film of a Hitler speech, hoping to give them a sense of the Nazi period in which my play took place. They watched as Hitler, facing a vast stadium full of adoring people, went up on his toes in ecstasy, hands clasped under his chin, a sublimely self-gratified grin on his face, his body swivelling rather cutely, and they giggled at his overacting.

Likewise, films of Senator Joseph McCarthy are rather unsettling—if you remember the fear he once spread. Buzzing his truculent sidewalk brawler’s snarl through the hairs in his nose, squinting through his cat’s eyes and sneering like a villain, he comes across now as nearly comical, a self-aware performer keeping a straight face as he does his juicy threat-shtick.

McCarthy’s power to stir fears of creeping Communism was not entirely based on illusion, of course; the paranoid, real or pretended, always secretes its pearl around a grain of fact. From being our wartime ally, the Soviet Union rapidly became an expanding empire. In 1949, Mao Zedong took power in China. Western Europe also seemed ready to become Red—especially Italy, where the Communist Party was the largest outside Russia, and was growing. Capitalism, in the opinion of many, myself included, had nothing more to say, its final poisoned bloom having been Italian and German Fascism. McCarthy—brash and ill-mannered but to many authentic and true—boiled it all down to what anyone could understand: we had “lost China” and would soon lose Europe as well, because the State Department—staffed, of course, under Democratic Presidents—was full of treasonous pro-Soviet intellectuals. It was as simple as that.

If our losing China seemed the equivalent of a flea’s losing an elephant, it was still a phrase—and a conviction—that one did not dare to question; to do so was to risk drawing suspicion on oneself. Indeed, the State Department proceeded to hound and fire the officers who knew China, its language, and its opaque culture—a move that suggested the practitioners of sympathetic magic who wring the neck of a doll in order to make a distant enemy’s head drop off. There was magic all around; the politics of alien conspiracy soon dominated political discourse and bid fair to wipe out any other issue. How could one deal with such enormities in a play?

“The Crucible” was an act of desperation. Much of my desperation branched out, I suppose, from a typical Depression-era trauma—the blow struck on the mind by the rise of European Fascism and the brutal anti-Semitism it had brought to power. But by 1950, when I began to think of writing about the hunt for Reds in America, I was motivated in some great part by the paralysis that had set in among many liberals who, despite their discomfort with the inquisitors’ violations of civil rights, were fearful, and with good reason, of being identified as covert Communists if they should protest too strongly.

In any play, however trivial, there has to be a still point of moral reference against which to gauge the action. In our lives, in the late nineteen-forties and early nineteen-fifties, no such point existed anymore. The left could not look straight at the Soviet Union’s abrogations of human rights. The anti-Communist liberals could not acknowledge the violations of those rights by congressional committees. The far right, meanwhile, was licking up all the cream. The days of “J’accuse” were gone, for anyone needs to feel right to declare someone else wrong. Gradually, all the old political and moral reality had melted like a Dali watch. Nobody but a fanatic, it seemed, could really say all that he believed.

President Truman was among the first to have to deal with the dilemma, and his way of resolving it—of having to trim his sails before the howling gale on the right—turned out to be momentous. At first, he was outraged at the allegation of widespread Communist infiltration of the government and called the charge of “coddling Communists” a red herring dragged in by the Republicans to bring down the Democrats. But such was the gathering power of raw belief in the great Soviet plot that Truman soon felt it necessary to institute loyalty boards of his own.

The Red hunt, led by the House Committee on Un-American Activities and by McCarthy, was becoming the dominating fixation of the American psyche. It reached Hollywood when the studios, after first resisting, agreed to submit artists’ names to the House Committee for “clearing” before employing them. This unleashed a veritable holy terror among actors, directors, and others, from Party members to those who had had the merest brush with a front organization.

The Soviet plot was the hub of a great wheel of causation; the plot justified the crushing of all nuance, all the shadings that a realistic judgment of reality requires. Even worse was the feeling that our sensitivity to this onslaught on our liberties was passing from us—indeed, from me. In “Timebends,” my autobiography, I recalled the time I’d written a screenplay (“The Hook”) about union corruption on the Brooklyn waterfront. Harry Cohn, the head of Columbia Pictures, did something that would once have been considered unthinkable: he showed my script to the F.B.I. Cohn then asked me to take the gangsters in my script, who were threatening and murdering their opponents, and simply change them to Communists. When I declined to commit this idiocy (Joe Ryan, the head of the longshoremen’s union, was soon to go to Sing Sing for racketeering), I got a wire from Cohn saying, “The minute we try to make the script pro-American you pull out.” By then—it was 1951—I had come to accept this terribly serious insanity as routine, but there was an element of the marvellous in it which I longed to put on the stage.

In those years, our thought processes were becoming so magical, so paranoid, that to imagine writing a play about this environment was like trying to pick one’s teeth with a ball of wool: I lacked the tools to illuminate miasma. Yet I kept being drawn back to it.