Reading about empirical Marxism

I have been trying to source texts on Marxism and empirical methods for a while now. This is from a text I read today.

Source: Empirical Marxism Gorman, Robert A. History and Theory, 1981-12, Vol.20 (4), p.403-423

It's very Western Marxism. Ignores imperialism completely which is why it's able to arrive to the conclusions it arrives to. And does the "Stalin a priori bad, does not need explaining" that most academic texts does.

It talkes about Austro-Marxism, a new one for me:

Dismissed Bernstein but circles right back to reformism and non-violence.

Circles back the other way and introduces an Italian called Galvano Della Vople who immediately gets called a stalinist, but whos views on empirical Marxism are still analyzed.

This is where this got interesting:

Then a student of De Volpe, Colletti enters the debate:

The last parts in comments