Karl Marx and Friedrich Engels

Friedrich Engels, The Origin of the Family, Private Property, and the State: An attempt by Marx's collaborator to apply Marxist theory to a variety of other social organizations.
Karl Marx, Economic and Philosophical Manuscripts of 1844: An early philosophical work by Marx.
Karl Marx and Friedrich Engels, The Communist Manifesto: This short document summarizes the Marxian views on economics and history.
Other works by Marx and Engels: Other online Marxian documents.