The conservative counter-revolution began with a secret memo, at least as the tale is often told on America’s political left, with the mix of fear and envy characteristic of the conspiracy-minded. In the summer of 1971 Lewis Powell was an eminent corporate lawyer, soon to be nominated and confirmed for the Supreme Court, when he drafted a confidential proposal for the US Chamber of Commerce. Powell laid out a costly, co-ordinated, years-long programme to counter the left’s influence in the media, the courts, the boardroom and, above all, universities. “There is reason to believe that the campus is the single most dynamic source” of an intensifying assault on free enterprise, he warned.