Theory of “Ultra-Imperialism” 1882 Preface to the First German Edition of Socialism: Utopian and Scientific A Single Spark Can Start a Prairie Fire Labor Theory of Value Karl Kautsky (1854–1938) Socialist Revolutionary Party Spread of Marxism in Russia August Bebel (1840–1913) Speech at the Meeting Celebrating the 90th Anniversary of the Founding of the People’s Liberation Army Social Structure