Labor unions History 140 Labor and laboring classes 78 Working class 46 Labor movement 38 Labor 29 Employment 24 more ... Coal miners 20 African Americans 19 Officials and employees 17 Railroads 15 Strikes and lockouts 15 Afro-American membership 14 Biography 14 Employees 13 Clothing workers 12 Labor laws and legislation 12 Social conditions 12 Agricultural laborers 11 Socialism 10 Communism 9 Race relations 9 Syndicats 9 Economic conditions 8 Histoire 8 Labor leaders 8 Stevedores 8 Industrial relations 7 Iron and steel workers 7 Coal mines and mining 6 Political activity 6 Wages 6 Clothing trade 5 Discrimination in employment 5 Merchant mariners 5 Societies, etc 5 Women labor union members 5 Brewery workers 4 Civil rights 4 Collective bargaining 4 less ...