The term ENGELS SUBJECT refers to the German philosopher and political theorist Friedrich Engels, who was a collaborator with Karl Marx in the development of Marxism. Engels is best known for his works on dialectical materialism, class struggle, and the labor theory of value. He also wrote extensively on the history of the working class and the role of the state in society. Engels' subject matter was largely focused on the economic and social conditions of the working class and the need for revolutionary change.