New York (CNN) Fox News talks about billionaire philanthropist George Soros a lot. He is a favorite bogeyman of the right, so Fox's conservative talk shows blame him for all sorts of ills, sometimes even pushing into conspiracy theory territory.

But the head of Soros's philanthropic group said the conservative network won't let him on air to rebut the wild accusations.

Patrick Gaspard, president of Soros's Open Society Foundations, told CNN's Brian Stelter on "Reliable Sources" Sunday that Fox News producers "refuse to have us on."

Fox News did not respond to CNN Business' request for comment about Gaspard's claim.

Conspiracy theories about Soros have spread for years among the far right.

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