Morris and Linda Tannehill were two libertarian activists and thinkers who, in the early 1970s, made surprisingly profound advances in the theory of the stateless society.
Their free-market manifesto, The Market for Liberty, was written just following a period of intense study of the writings of both Ayn Rand and Murray Rothbard; it has the pace, energy, and rigor you would expect from an evening's discussion with either of these two giants.
Ludwig von Mises: "There is no such thing as an absolute notion of justice not referring to a definite system of social organization. . . . There is neither right nor wrong outside the social nexus." - Human Action