Labor unions 508 History 151 Labor and laboring classes 80 Working class 61 Labor movement 47 Employment 37 Labor 35 more ... African Americans 27 Clothing workers 25 Coal miners 21 Periodicals 20 Strikes and lockouts 20 Congresses 18 Railroads 18 Officials and employees 17 Employees 16 Biography 15 Afro-American membership 14 Societies, etc 14 Clothing trade 13 Socialism 13 Communism 12 Discrimination in employment 12 Labor laws and legislation 12 Labor unions and communism 12 Social conditions 12 Stevedores 12 Agricultural laborers 11 Syndicats 11 Histoire 10 African American labor union members 9 Labor leaders 9 Race relations 9 Economic conditions 8 Industrial relations 8 Political activity 8 Civil rights 7 Foreign workers 7 Iron and steel workers 7 Textile workers 7 less ...