Socialism 7 Saving and investment 5 Capitalism 4 Imperialism 4 History 3 Biography 2 Communism 2 Communists 1 Congresses 1 Economic policy 1 Economic stabilization 1 European - social condition 1 Feminism--Political aspects 1 Germany 1 Logic, Symbolic and mathematical 1 Luxemburg, Rosa 1 Luxemburg, Rosa, 1871-1919 1 Malayalam; Communism/Marxism 1 Mathematical modeling 1 Militarism 1 Nationalism--Poland 1 Nonstandard mathematical analysis 1 Political theories and ideologies 1 Politics and government 1 Research 1 Revolution--Political science 1 Revolutions--Philosophy 1 Social Sciences 1 Social conditions 1 Social sciences 1