Political Compass scores of the following

[jokerman]

Karl Marx      Social:+10, Economic:-10  Perfect authoritarian score

I doubt it.

More like arond Eco: -10, Social +1
He would definitly have a authoritarian bent he, like communism in general, cannot be said to have a "right" social bent because of there support for secularism.  In fact true communism under Marx's vision would perhaps be near Opebo territory on social issues.