Robert Paul Wolff is member of the philosophy department of Columbia University and the author of "Kant's Theory of Mental Activity" and "The Poverty of Liberalism".

Barrington Moore, Jr., is a member of the Russian Research Center at Harvard and the author of "Political Power and Social Theory", "Social Origins of Dictatorship and Democracy", and other books.

Herbert Marcuse is a member of the philosophy department of the university of California at San Diego. Among the books he has written are "Eros and Civilization", "One-Dimensional Man", and "An Essay on Liberation".