This book comprises a systematic analysis of Karl Marx's reasoning on ownership. Marx as the author of an original theory of ownership is yet to be discovered. The creator of a theory which was to interpret social reality is quite a different thinker from the creator of a doctrine which was to alter the world. In designing communist society, Marx ignored the threats which social property bears, despite having skillfully identified them in investigations of diverse pre-capitalistic forms of common ownership. The author seeks to break through one-sided interpretations which discern in Marx a decisive critique of private property and an apologia of common ownership. It becomes apparent that Marx treated both the processes of socialization and privatization of ownership with equal consideration.