Especially influential regarding these topics have been scholars including Long, Johnson, Sciabarra and Arthur Silber. The genealogy of contemporary market-oriented left-libertarianism, sometimes labeled left-wing market anarchism, overlaps to a significant degree with that of Steiner–Vallentyne left-libertarianism as the roots of that tradition are sketched in "The Origins of Left-Libertarianism". Carson–Long-style left-libertarianism is rooted in 19th-century mutualism and in the work of figures such as the British Thomas Hodgskin and the American individualist anarchists Benjamin Tucker and Lysander Spooner. While with notable exceptions market-oriented libertarians after Tucker tended to ally with the political right, relationships between such libertarians and the New Left thrived in the 1960s, laying the groundwork for modern left-wing market anarchism.