I was reading Larry White's chapter on The Road to Serfdom from his The Clash of Economic Ideas. (Looks like a very good book, by the way.) I was struck again by how libertarians and socialists are usually talking past each other when they discuss "capitalism."
White notes that many on the left regarded fascism and Nazism as a "capitalist" reaction to the rise of socialism. Hayek disputed this, and said that both movements had more in common with socialism than with capitalism.
Well, what does one mean by "capitalism"? If you mean an economy with very little government involvement, then Hayek is certainly correct: the fascists and Nazis were perfectly willing to intervene heavily in the economy.
But if by "capitalism" one means "that system of political economy being supported by those who own capital," then the socialists had a point: these movements certainly had the support of many business owners, who thought it was better to be directed as to how to use their capital than to simply have it taken from them.