As it shows on the title.
What if Karl Marx never put his ideas on the table? What if he died for some reason in the early 1840's or remains a left Hegelian?
What would have been the consequences for the worker movements, economics, and more generally History?
(For the discussion's sake : Bakunin, Bebel, Dietzgen, Engels, Proudhon, etc. are still pursuing a life comparable to IOTL)