Lysander Spooner (1808-1887) was a strong advocate of the labor movement and anti-authoritarian and individualist anarchist in his political views. His economic and political ideology has been identified by some scholars libertarian socialism, left-libertarianism, free-market socialism, and mutualism, while others identify them as right-libertarian, anarcho-capitalist, and propertarianist. According to anarchist George Woodcock, Spooner was a member of the International Workingmen's Association (First International). His writings contributed to the development of both left-libertarian and right-libertarian political theory.