Which author co-wrote "The Communist Manifesto" alongside Karl Marx?

The story behind the answer

Friedrich Engels co-wrote The Communist Manifesto with Karl Marx, published in 1848 for the Communist League. The pamphlet distilled their theory of historical materialism and class struggle, calling on the proletariat to unite against the bourgeoisie. Engels, a German philosopher and the son of a textile magnate, drew on his observations of workers in Manchester to inform their analysis and also financially supported Marx.

Engels later edited and published volumes of Marx’s Capital, cementing their intellectual partnership. To remember: “Marx & Engels = M & E wrote the Manifesto.” Don’t confuse the distractors—Paul Lafargue was Marx’s son-in-law and a socialist writer, Robert Owen was an earlier utopian socialist, and Alexander Kerensky led Russia’s Provisional Government in