[pt] No cenário político do Estados Unidos após 1945, o libertarianismo esteve intrinsicamente ligado ao ressurgimento do movimento conservador. Entretanto, no efervescente ambiente político da década de 60, alguns intelectuais libertários, como Murray Rothbard, decidiram trilhar um caminho diferente. Esses intelectuais passaram a reavaliar suas opções ideológicas, buscando, assim, por alternativas para lidar com os principais dilemas da época. Com a finalidade de melhor entender essas mudanças, esta dissertação teve como objetivo investigar a reinterpretação do libertarianismo operada por Murray Rothbard em sua atuação na revista Left and Right: A Journal of Libertarian Thought, criada em 1965. Para isso, foram apresentadas as principais expressões do pensamento libertário na política norte-americana dos séculos XIX e XX. Em seguida, analisou-se os textos de Rothbard presentes na Left and Right entre 1965 e 1968, a fim de entender suas principais ideias, alianças e conflitos políticos. Dessa forma, as estratégias utilizadas por Rothbard em sua reinterpretação do libertarianismo foram melhor elucidadas, tornando este trabalho uma importante oportunidade de refinar as concepções acerca dessa corrente política no cenário norte-americano. / [en] In the US political scenario of the aftermath of 1945, libertarianism became intrinsically connected with the rebirth of the conservative movement. Nevertheless, the effusive political environment of the 1960s made Murray Rothbard and other few libertarian intellectuals choose and take a different road to travel. These intellectuals began reviewing some of their ideological options and, therefore, looking for alternatives in order to deal with their main epochal dilemma. In order to better understand these many changes, I intend, in this Dissertation, to investigate the reinterpretation of libertarianism proposed by Murray Rothbard through his writings in Left and Right. A Journal of Libertarian Though, created in 1965. In order to accomplish this, I began by commenting on some of the main voices of the 19 th - and 20 th - century libertarian thought in American politics. I then analyzed all Rothbard articles in Left and Right, between 1965 and 1968, so that some of his main ideas, and understandings regarding political alliances and conflicts, could be made clear. The strategies he enacted in his singular reinterpretation of libertarianism seem to have been better elucidated with this work. We expect such an effort turns out to be a helpful aid in the future refining of ideas and conceptions still in use in the rhetorics of North-American political scene.

This thesis discusses the possibility of social order based strictly on market and liberty principles, thus without a state hegemony. Firstly It's said that the rules of social order don't have to be necessarily products of legislation. That implies that stateless society doesn't mean that rules don't exist at all. Next the thesis explains fundamental principles of libertarian ethics -- self-ownership, homesteading and non-aggression principle. These principles give us the answer why state is an institution incompatible with individuals' rights. In the last chapter, thesis discusses the possibilities of private providing of some public services and goods, which are provided by the state these days. Conclusion is that these public goods don't differ from any other goods provided on private basis, so institution of state isn't that vital as we are forced to believe.