"Although it is developed in the crude English style, this is a book which contains the BASIS of natural history for our views." Karl Marx
You can opine all day about his motives but those are the words of Marx himself speaking of the connection between Marxism and Evolution.
You will go on to deny that there are no links even though people on this forum have pointed them out including the ideas behind the theories.
I find the quote fascinating. Marx considereed his theories an evolution in the world of capital which paralleled evolutionary theories in the natural world, thus the accolades for Darwin, a like-minded thinker.