Labor and laboring classes 376 Labor unions 80 History 66 Economic conditions 28 Social conditions 27 Employment 23 Fiction 21 more ... Radicalism 19 Strikes and lockouts 17 Socialism 15 Biography 12 Communism 12 Dwellings 12 Politics and government 10 Women 10 Addresses, essays, lectures 9 Emigration and immigration 9 Labor laws and legislation 9 Periodicals 9 African Americans 8 Housing 8 Industries 8 Poor 8 Songs and music 8 Wages 8 Jews 7 Capitalism 6 Working class 6 Cost and standard of living 5 Labor 5 Poetry 5 Chinese 4 Ethnic groups 4 Industrial relations 4 Officials and employees 4 Political activity 4 Race relations 4 Social life and customs 4 Tenement houses 4 Agricultural laborers 3 less ...