just because he was "for the worker" doesn't mean that being "for the worker" is a bad thing. ditto, free trade.
his conclusions are not Writ, are very apt to be fanciful, and we all know that his key premises were incorrect.
Anybody calling itself "the invisib1e hand" should already know that Marx's analysis of the economic consequences of free trade was in complete agreement with other classical economists like Adam Smith and David Ricardo. It is only his proposal to construct a utopian collectivist alternative that was in dismal error.