Labor unions 507 Labor and laboring classes 376 History 281 Working class 183 Labor 177 Labor movement 171 Employment 107 more ... Social conditions 67 Economic conditions 66 African Americans 60 Labor laws and legislation 56 Agricultural laborers 54 Labor supply 50 Periodicals 49 Slave labor 45 Socialism 43 Emigration and immigration 39 Strikes and lockouts 38 Communism 32 Slavery 32 Wages 28 Migrant labor 27 Societies, etc 27 Clothing workers 26 Coal miners 26 Histoire 26 Migrant agricultural laborers 25 Biography 24 Foreign workers 24 Employees 23 Radicalism 23 Women 23 Child labor 22 Fiction 22 Political activity 22 Race relations 22 Congresses 21 Hours of labor 21 Politics and government 21 Industrial relations 20 less ...