Labor movement History 54 Trade-unions 33 Labor unions 26 Working class 17 Socialism 14 Industrial relations 11 Economic conditions 9 Politics and government 7 Social conditions 6 Labor 5 Biography 4 Political activity 4 Bibliography 3 Economic aspects 3 Economic policy 3 Labor laws and legislation 3 Labor policy 3 Socialists 3 Anarchism 2 Communism 2 Industries 2 Labor disputes 2 Labor economics 2 Labor supply 2 Peasantry 2 Periodicals 2 Syndicalism 2 World War, 1914-1918 2 Administration 1