All ownership derives from occupation and violence. When we consider the natural components of goods, apart from the labour components they contain, and when we follow the legal title back, we must necessarily arrive at a point where this title originated in the appropriation of goods accessible to all. Before that we may encounter a forcible expropriation from a predecessor whose ownership we can in its turn trace to earlier appropriation or robbery. That all rights derive from violence, all ownership from appropriation or robbery, we may freely admit to those who oppose ownership on considerations of natural law. But this offers not the slightest proof that the abolition of ownership is necessary, advisable, or morally justified.
Ludwig von Mises, Socialism, 1922