Leonard Peikoff, David Kelley, and Yaron Brook, have continued to hold pro-Israel positions since Rand's death. Most scholars of the right-libertarian Cato Institute have opposed military intervention against Iran, while the Objectivist Ayn Rand Institute has supported forceful intervention in Iran. Rand's influence on libertarianism United States Libertarian Party's first candidate for President John Hospers credited Rand as a major force in shaping his own political beliefs. David Boaz, executive vice president of the Cato Institute, an American libertarian think tank, described Rand's work as "squarely within the libertarian tradition" and that some libertarians are put off by "the starkness of her presentation and by her cult following". Milton Friedman described Rand as "an utterly intolerant and dogmatic person who did a great deal of good". One Rand biographer quoted Murray Rothbard as saying that he was "in agreement basically with all [Rand's] philosophy" and that it was Rand who had "convinced him of the theory of natural rights". Rothbard would later become a particularly harsh critic of Rand, writing in The Sociology of the Ayn Rand Cult: Some Objectivists have argued that Objectivism is not limited to Rand's own positions on philosophical issues and are willing to work with and identify with the libertarian movement. This stance is most clearly identified with David Kelley (who separated from the Ayn Rand Institute because of disagreements over the relationship between Objectivists and libertarians), Chris Sciabarra, Barbara Branden (Nathaniel Branden's former wife) and others. Kelley's Atlas Society has focused on building a closer relationship between "open Objectivists" and the libertarian movement. Rand's view of libertarians Rand condemned libertarianism as being a greater threat to freedom and capitalism than both modern liberalism and conservatism. Rand regarded Objectivism as an integrated philosophical system. In contrast, libertarianism is a political philosophy which confines its attention to matters of public policy. For example, Objectivism argues positions in metaphysics, epistemology and ethics whereas libertarianism does not address such questions. Rand believed that political advocacy could not succeed without addressing what she saw as its methodological prerequisites. Rand rejected any affiliation with the libertarian movement and many other Objectivists have done so as well. Of libertarians, Rand said: In a 1981 interview, Rand described libertarians as "a monstrous, disgusting bunch of people" who "plagiarize my ideas when that fits their purpose". Responding to a question about the Libertarian Party of the United States in 1976, Rand said: Rapprochement