German social theorist Friedrich Engels collaborated with Karl Marx on
The Communist Manifesto
in 1848 and on numerous other works.
With the help of Friedrich Engels, Karl Marx wrote The Communist Manifesto (1848) and
Das Kapital
(1867-1894).
Friedrich Engels, a philosopher, political, historian, journalist, revolutionary, and also a businessman, closest befriended his lifelong colleague.
https://en.wikipedia.org/wiki/Friedri...