Marx was a situationist

From one of Marx's letters

http://www.marxists.org/archive/marx/works/1843/letters/43_09.htm

The reform of consciousness consists only in making the world aware of its own consciousness, in awakening it out of its dream about itself, in explaining to it the meaning of its own actions. Our whole object can only be — as is also the case in Feuerbach’s criticism of religion — to give religious and philosophical questions the form corresponding to man who has become conscious of himself.

Hence, our motto must be: reform of consciousness not through dogmas, but by analysing the mystical consciousness that is unintelligible to itself, whether it manifests itself in a religious or a political form.

It will then become evident that the world has long dreamed of possessing something of which it has only to be conscious in order to possess it in reality. It will become evident that it is not a question of drawing a great mental dividing line between past and future, but of realising the thoughts of the past. Lastly, it will become evident that mankind is not beginning a new work, but is consciously carrying into effect its old work.


From Society of the Spectacle

164 The world already possesses the dream of a time whose consciousness it must now possess in order to actually live it.