Labor unions 535 History 162 Labor and laboring classes 81 Working class 68 Labor movement 51 Employment 40 Labor 37 more ... African Americans 27 Clothing workers 26 Coal miners 22 Periodicals 20 Strikes and lockouts 20 Syndicats 19 Congresses 18 Employees 18 Railroads 18 Officials and employees 17 Histoire 16 Societies, etc 16 Biography 15 Afro-American membership 14 Discrimination in employment 14 Socialism 14 Agricultural laborers 13 Clothing trade 13 Labor laws and legislation 13 Stevedores 13 Communism 12 Labor unions and communism 12 Social conditions 12 Political activity 10 African American labor union members 9 Foreign workers 9 Labor leaders 9 Race relations 9 Economic conditions 8 Industrial relations 8 Minority labor union members 8 Civil rights 7 Coal mines and mining 7 less ...