a German philosopher, social scientist and journalist, who founded Marxist theory together with Karl Marx. In 1845 he published The Condition of the Working Class in England, based on personal observations and research in Manchester. In 1848 he co-authored The Communist Manifesto with Karl Marx, though he also authored and co-authored (primarily with Marx) many other works, and later he supported Marx financially to do research and write Das Kapital. After Marx's death, Engels edited the second and third volumes.
