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.