Black theologian James H. Cone wrote in his book For My People that "for analyzing the structure of capitalism. Marxism as a tool of social analysis can disclose the gap between appearance and reality, and thereby help Christians to see how things really are". Autonomist Marxism Autonomism is a category of Marxist social movements around the world that emphasize the ability to organize in autonomous and horizontal networks, as opposed to hierarchical structures such as unions or parties. Early autonomist theorists such as Antonio Negri, as well as Mario Tronti, Paolo Virno, Sergio Bologna and Franco "Bifo" Berardi, developed notions of "immaterial" and "social labour", which broaden the definition of the working-class to include salaried and unpaid labour, such as skilled professions and housework, this extended the Marxist concept of labour to all society. They suggested that modern society's wealth was produced by unaccountable collective work, which in advanced capitalist states as the primary force of change in the construct of capital, and that only a little of this was redistributed to the workers in the form of wages. Other theorists including Mariarosa Dalla Costa and Silvia Federici emphasised the importance of feminism and the value of unpaid female labour to capitalist society, adding these to the theory of Autonomism. Negri and Michael Hardt argue that network power constructs are the most effective methods of organization against the neoliberal regime of accumulation and predict a massive shift in the dynamics of capital into a 21st century empire. Harry Cleaver is an autonomist and Marxist theoretician, who authored Reading Capital Politically, an autonomist reading of Marx's Capital. Analytical Marxism Analytical Marxism refers to a style of thinking about Marxism that was prominent among a half-dozen analytically trained English-speaking philosophers and social scientists during the 1980s. It was mainly associated with the September Group of academics, so called because they have biennial meetings in varying locations every other September to discuss common interests. The group also dubbed itself "Non-Bullshit Marxism". In the words of David Miller, it was characterized by "clear and rigorous thinking about questions that are usually blanketed by ideological fog". British Marxist historians The British Marxist historians were a circle of scholars that originated in the Communist Party of Great Britain in the 1930s, eventually forming the Communist Party Historians Group in 1946. They shared a common interest in "history from below" and class structure in early capitalist society.