“I live in an age of fear,” lamented the essayist and author EB White in 1947, after the New York Herald had suggested that all employees be forced to declare their political beliefs to retain their jobs. He was, he insisted, less worried “that there were communists in Hollywood” than to “read your editorial in praise of loyalty testing and thought control”. It is a perspective as vital now as it was then, and as necessary on this side of the Atlantic as in America.