This book re-examines and brings to light the libertarian components of Marx's and Engel's political and economic thought. Central to the book is a discussion of the notion of freedom in Marx and Engel's work. In a post-Soviet world, there is a need to revise Marxism in the search for a libertarian foundation of political economy. The book argues that the libertarian foundations were present in Marx's and Engel's work and utilizes contemporary theory's of freedom to re-interpret and analyse their original work.