Geolibertarians are generally influenced by the Georgist single tax movement of the late-19th and early-20th centuries, but the ideas behind it pre-date Henry George and can be found in different forms in the political writings of John Locke, the early agrarian socialism of English True Levellers or Diggers such as Gerrard Winstanley, the French Physiocrats (especially Quesnay and Turgot), British classical economists Adam Smith and David Ricardo, French liberal economists Jean-Baptiste Say and Frédéric Bastiat, American Revolutionary writers Thomas Jefferson and Thomas Paine, English Radical land reformer Thomas Spence, American individualist anarchists Lysander Spooner and Benjamin Tucker, as well as British classical liberal philosophers John Stuart Mill and Herbert Spencer. Prominent geolibertarians since George have included Old Right social critics Albert Jay Nock and Frank Chodorov. Other libertarians who have expressed support for the land value tax as an incremental reform include Milton Friedman, Karl Hess, John Hospers and United States Libertarian Party co-founder David Nolan.