Also, in 1956, Hayek and Wilhelm Röpke, both MPS founding members, strongly diverged on the role of unions at the Berlin meeting. As reported by a Swiss journalist and MPS member, Ernst Bieri (Neue Zürcher Zeitung), Röpke was unconvinced by Hayek's severe condemnation of unions. To Röpke, they proved their usefulness in the defense of free economy as the Swiss case demonstrated. Condemnation of unions per se was then an absurdity (Bieri 1956).

Philip Mirowski & Dieter Plehwe (eds.), The Road from Mont Pèlerin, loc. 1004