Left-libertarianism (or left-wing libertarianism) names several related but distinct approaches to political and social theory, which stresses both individual freedom and social equality. In its oldest usage, left-libertarianism is a synonym for anti-authoritarian varieties of left-wing politics, either anarchism in general or social anarchism in particular. It later became associated with free-market libertarians when Murray Rothbard and Karl Hess reached out to the New Left in the 1960s. This left-wing market anarchism, which includes Pierre-Joseph Proudhon's mutualism and Samuel Edward Konkin III's agorism, appeals to left-wing concerns such as egalitarianism, gender and sexuality, class, immigration, and environmentalism. Most recently, left-libertarianism refers to mostly non-anarchis