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Marx was for "Free Trade".

In what universe? Marx was for central economic planning - the exact opposite of free trade.

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But, in general, the protective system of our day is conservative, while the free trade system is destructive. It breaks up old nationalities and pushes the antagonism of the proletariat and the bourgeoisie to the extreme point. In a word, the free trade system hastens the social revolution. It is in this revolutionary sense alone, gentlemen, that I vote in favor of free trade.

-- Karl Marx

On the Question of Free Trade - Link