The relationship between conservatism and libertarianism is a tenuous one. However, such was not always the case. Fellow travelers of both groups were united in opposing Roosevelt’s New Deal. The work of the late economist Murray N. Rothbard (1926–1995) on the “Old Right” is indispensable here. After World War II, the political right was generally opposed, not only to “domestic statism,” but also to war, foreign intervention, and “American statism in the international arena.” But after the death of the political and intellectual leaders of the Old Right, the conservative movement — which “was basically classical liberal and libertarian” in the 1930s and 1940s — suffered a “power vacuum in both the political and the intellectual areas,” and was taken over and transformed “beyond recognition” by William Buckley (1925–2008) and those associated with him at National Review magazine.