on occupation and use property norms. It is this distinction which has led to the rift between anarchism and anarcho-capitalism, with the latter supporting the homestead principle. As anarchists consider themselves to be socialists and opposed to capitalism, anarcho-capitalism is seen as not being a form of anarchism. Anarchist organisations such as the Confederación Nacional del Trabajo (Spain) and the Anarchist Federation (Britain and Ireland) generally take an explicitly anti-capitalist stance. When in the 20th century several economists began to formulate a form of radical American libertarianism known as anarcho-capitalism, this has met resistance from those who hold that capitalism is inherently oppressive or statist and many anarchists and scholars do not consider anarcho-capitalism to properly cohere with the spirit, principles, or history of anarchism. While other anarchists and scholars regard anarchism as referring only to opposition to the non-privatisation of all aspects of the state and do consider anarcho-capitalism to be a form of anarchism,Kevin Carson, Roderick T. Long, Charles W. Johnson, Brad Spangler, Sheldon Richman and Chris Matthew Sciabarra maintain that—because of its heritage, emancipatory goals and potential—radical market anarchism should be seen by its proponents and by others as part of the socialist tradition and that market anarchists can and should call themselves socialists, echoing the language of American individualist anarchists like Benjamin Tucker and Lysander Spooner and British Thomas Hodgskin. William Gillis has argued that proponents of a genuinely free market, termed freed market to distinguish it from the common conception which those left-libertarians believe markets to be riddled with capitalist and statist privileges, should explicitly reject capitalism and identify with the global anti-capitalist movement while emphasizing that the abuses the anti-capitalist movement highlights result from state-tolerated violence and state-secured privilege rather than from voluntary cooperation and exchange. Those left-libertarians, also referred to as left-wing market anarchists and market-oriented left-libertarians, distingue themselves from anarcho-capitalists. Like anarcho-capitalists, proponents of this approach strongly affirm the classical liberal ideas of self-ownership and free markets, but they maintain that taken to their logical conclusions these ideas support anti-capitalist, anti-corporatist, anti-hierarchical and pro-labor positions in economics; anti-imperialism in foreign policy; and thoroughly radical views regarding socio-cultural issues. Anarcho-capitalists who argue for private property which supports absentee and landlordism ownership rather than occupation and use property norms as well as the principle of homesteading are considered right-libertarians rather than anarchists. This is due to anarchism, including the individualists, viewing any absentee ownership