I am stuck in a vast amount of papers concerning Marx's view of justice, written in the 70s, 80s and 90s, disputing and contradicting each other. With my current knowledge of Marx, it is sometimes difficult, sometimes impossible, to decide whose interpretation is the closest to the truth or whose speculation (as Marx didn't write a lot about his notion of justice, at least not explicitly) is more coherent.
The question my professor made me answer in my term paper is "If Marx's notion of justice is not a egalitarian one, why is the absorption of surplus value by the capitalist unjust?" Now, I am not exactly sure where that idea (for he does think that Marx's theory of justice is nothing more than a egalitarian theory of justice) came from, but no matter what I read, it always seems to contradict his conclusion or the premise. Also I don't want to only explain why this is not the case, but at least give some answers on the question what a Marxist theory of justice could be.
What would help immensely is a book that takes into account all previous positions (i.e. these old papers), and, if possible, reflects the latest state of research (if for no other reason, it looks better if not all my sources can be dismissed as obsolete/out of date).
What I do have so far are the papers by Wood, Husami and Nielsen (as well as others) and the Oxford book by Buchanan, Marx and Justice: The Radical Critique of Liberalism.
Is there any newer literature that you can recommend?
Does anybody know of any passage in any of Marx's texts that, more or less literally, speaks of the absorption of surplus value being unjust?
Is there any literature on Marx as Egalitarian?