No one may threaten or commit violence ('aggress') against another man's person or property. Violence may be employed only against the man who commits such violence; that is, only defensively against the aggressive violence of another. In short, no violence may be employed against a non-aggressor. Here is the fundamental rule from which can be deduced the entire corpus of libertarian theory.
Murray RothbardThe State is a gang of thieves writ large - the most immoral, grasping and unscrupulous individuals in any society.
Murray Rothbard[Professional politicians] don't mind if price controls cause shortages of health care. In fact, they welcome the prospect, because then they can impose rationing; they can impose priorities, and tell everyone how much of what kind of medical care they can have. And besides, ... there's that deeply satisfying rush of power.
Murray RothbardPollution and overuse of resources stem directly from the failure of government to defend private property. If property rights were to be defended adequately, we would find that here, as in other areas of our economy and society, private enterprise and modern technology would come not as a curse to mankind but as its salvation.
Murray Rothbard