George Orwell, in his immortal 1946 essay "The Prevention of Literature," delineates a distinction between two types of attackers of intellectual freedom, both real but one in a sense more real than the other. "On the one side," he writes, "are its theoretical enemies, the apologists of totalitarianism, and on the other its immediate, practical enemies, monopoly and bureaucracy." This distinction is at least as useful in the age of Trump and social media. The new book by journalist Jacob Siegel,