It had been around a long time before the Radical Right discovered it—and its targets have ranged from “the international bankers” to Masons, Jesuits, and munitions makers.

American politics has often been an arena for angry minds. In recent years we have seen angry minds at work mainly among extreme right-wingers, who have now demonstrated in the Goldwater movement how much political leverage can be got out of the animosities and passions of a small minority. But behind this I believe there is a style of mind that is far from new and that is not necessarily right-wing. I…