L. Albert Hahn was one of the most highly regarded economists and bankers in Germany before the war but he was unknown in the United States until the 1949 translation of The Economics of Illusion, his frontal attack on the Keynesian system.
Ludwig von Mises: "Marx and Engels never tried to refute their opponents with argument. They insulted, ridiculed, derided, slandered, and traduced them, and in the use of these methods their followers are not less expert. Their polemic is directed never against the argument of the opponent, but always against his person." - Socialism