Leftist attacks on the morality Rawlsian liberalism and Right Libertarianism?

[RadioRaheem84]

While I wait for copies of GA Cohen's books to come in. Does anyone have any good articles by Marxists like him that critique the morality of both Rawlsian Liberals and neo-classical libertarian/classical liberals? I mean the little stuff GA Cohen says is remarkable and I am surprised I have not read it before by many people on the left. He smashed the moral superiority of both sets of liberals and their insistence on being the moral center.

Anyone else have any recommendations? Kudos, to Explosive Situation for introducing me to GA Cohen!