Since 1974, eight members of the Mont Pelerin Society have received the Nobel Memorial Prize in Economic Sciences from the Royal Swedish Academy of Sciences.  You can, of course, disagree with members of this society but dismissing them as right wing extremists seems to be taking the sloppy, lazy person's way out.

During that period of time, Hayek, von Mises and others were rightly concerned about Nazism, Communism and unemployment.  Many members of the Austrian school, such as Hayek and von Mises, actually had to leave Austria because they were considered to be Jewish under the Nazi racial laws.  If you were Jewish in Central Europe in the 1930's, libertarianism might have seemed an attractive alternative to Ein Volk, Ein Reich, Ein Fuhrer.