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1. Friedrich Engels to Franz Mehring, London, July 14, 1893, in Marx and Engels Collected Works, Vol. 50 (London: Lawrence and Wishart, 2010), 164. 2. Karl Mannheim, Ideology and Utopia: An Introduction to the Sociology of Knowledge (New York: Harcourt, 1936), 73. 3. Karl Marx, The German Ideology (New York: Prometheus Books, 1998), 42. 4. Mannheim, Ideology and Utopia, 64. 5. Mannheim, Ideology and Utopia, 96.