… is from page 417 of F.A. Hayek’s Spring 1949 University of Chicago Law Review paper titled “The Intellectuals and Socialism “:
Socialism has never and nowhere been at first a working-class movement. It is by no means an obvious remedy for the obvious evil which the interests of that class will necessarily demand. It is a construction of theorists, deriving from certain tendencies of abstract thought with which for a long time only the intellectuals were familiar; and it required long efforts by the intellectuals before the working classes could be persuaded to adopt it as their program.