This article considers the nature of Marxism as a species of Enlightenment Utopian Socialism, the relation of both these to a denial of nature of common sense properly understood. It argues that underlying all species of Enlightenment Utopian Socialism are psychological principles that deny the reality of evidently known first principles of understanding that are measures of truth in all forms of psychologically healthy human knowing and reasoning. In addition, it maintains that, as a result of these essentially anarchic psychological first principles inherent in its nature, any attempt to apply any species of Utopian Socialism to develop healthy social organizations and cultural institutions—such as forms of human communication and educati...