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After the Marxist revolution failed to topple capitalism in the early twentieth century, many Marxists went back to the drawing board, modifying and adapting Marx’s ideas. Perhaps the most famous was a group associated with the Institute for Social Research in Frankfurt, Germany, which applied Marxism to a radical interdisciplinary social theory. The group included Max Horkheimer, T.W. Adorno, Erich Fromm, Herbert Marcuse, Georg Lukács, and Walter Benjamin and came to be known as the Frankfurt School. These men developed Critical Theory as an expansion of Conflict Theory and applied it more broadly, including other social sciences and philosophy. Their main goal was to address structural issues causing inequity. They worked from the assumption that current social reality was broken, and they needed to identify the people and institutions that could make changes and provide practical goals for social transformation.
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Voddie T. Baucham Jr. (Fault Lines: The Social Justice Movement and Evangelicalism's Looming Catastrophe)