"One of the clearest, non-tautological definitions of rights of which I am aware is James Sadowsky's definition: "When we say that one has the right to do certain things we mean this and only this, that it would be immoral for another, alone or in combination, to stop him from doing this by the use of physical force or the threat thereof. We do not mean that any use a man makes of his property within the limits set forth is necessarily a moral use." James A. Sadowsky, "Private Property and Collective Ownership," in The Libertarian Alternative, Tibor R. Machan, ed."