All history has been a history of class struggles between dominated classes at various stages of social development.

Z. Engels also wrote some important newspaper articles such as "The Campaign for the German Imperial Constitution" which he finiFriedrich Engelsd in February 1850 and "On the Slogan of the Abolition of the State and the German 'Friends of Anarchy'" written in October 1850. Brussels
From 1845 to 1848 Engels and Marx lived in Brussels spending much of their time organizing the city's German workers.

Additionally Engels organized Marx's notes on the "Theories of Surplus Value" and this was later publiFriedrich Engelsd as the "fourth volume" of Capital. In 1848 he co-authored The Communist Manifesto with Karl Marx and later he supported Marx financially to do research and write Das Kapital.