The Marx and Engels Collected Works is the a carefully compiled collection of translations into English of the most significant works of Karl Marx and Friederich Engels.

Marx and Engels founded Marxist theory. In 1848 the co-authored The Communist Manifesto was published. Later, Engels supported Marx financially to do research and write Das Kapital.

Marxism is a social, political, and economic philosophy named after Karl Marx. Engels developed what is now known as Marxism together with Karl Marx.

Karl Marx The Communist Manifesto

Karl Marx The Capital 

Karl Marx The Eighteenth Brumaire of Louis Bonaparte

Karl Marx A Contribution to the Critique of Political Economy

Friederich Engels Socialism: Utopian and Scientific

Friederich Engels The Origin of the Family Private Property and the State

Friederich Engels Feuerbach: The roots of the socialist philosophy