1883, Marx wrote to his son-in-law Paul Lafargue and French labour leader Jules Guesde—both of whom claimed to represent Marxist principles—accusing them of "revolutionary phrase-mongering" and denying the value of reformist struggle. From Marx's letter derives the paraphrase, "If that is Marxism, then I am not a Marxist." Accusing Guesde and Lafargue of "revolutionary phrase-mongering" and "of denying the value of reformist struggles, Marx made his famous remark that, if their politics represented Marxism, '' ('what is certain is that I myself am not a Marxist')." American Marxist scholar Hal Draper responded: "There are few thinkers in modern history whose thought has been so badly misrepresented, by Marxists and anti-Marxists alike." Libertarian Libertarian Marxism emphasizes the anti-authoritarian and libertarian aspects of Marxism. Early currents of libertarian Marxism, such as left communism, emerged in opposition to Marxism–Leninism. Libertarian Marxism is often critical of reformist positions such as those held by social democrats. Libertarian Marxist currents often draw from Karl Marx and Friedrich Engels' later works, specifically the and The Civil War in France; emphasizing the Marxist belief in the ability of the working class to forge its destiny without the need for a vanguard party to mediate or aid its liberation. Along with anarchism, libertarian Marxism is one of the main currents of libertarian socialism. Libertarian Marxism includes currents such as autonomism, council communism, De Leonism, Lettrism, parts of the New Left, Situationism, Freudo-Marxism (a form of psychoanalysis), Socialisme ou Barbarie and workerism. Libertarian Marxism has often strongly influenced both post-left and social anarchists. Notable theorists of libertarian Marxism have included Maurice Brinton, Cornelius Castoriadis, Guy Debord, Raya Dunayevskaya, Daniel Guérin, C. L. R. James, Rosa Luxemburg, Antonio Negri, Anton Pannekoek, Fredy Perlman, Ernesto Screpanti, E. P. Thompson, Raoul Vaneigem, and Yanis Varoufakis, the latter claiming that Marx himself was a libertarian Marxist. Humanist Marxist humanism was born in 1932 with the publication of Marx's Economic and Philosophic Manuscripts of 1844 and reached a degree of prominence in the 1950s and 1960s. Marxist humanists contend that there is continuity between the early philosophical writings of Marx, in which he develops his theory of alienation, and the structural description of capitalist society found in his later works, such as Capital. They hold that grasping Marx's philosophical foundations is necessary to understand his later works properly. Contrary to the official dialectical materialism of the Soviet Union and interpretations of Marx rooted in the