Labor unions History 142 Labor and laboring classes 80 Working class 56 Labor movement 43 Employment 33 Labor 33 more ... Clothing workers 25 African Americans 22 Coal miners 21 Strikes and lockouts 20 Periodicals 19 Congresses 18 Railroads 18 Officials and employees 17 Employees 16 Afro-American membership 14 Biography 14 Clothing trade 13 Societies, etc 13 Labor laws and legislation 12 Social conditions 12 Socialism 12 Agricultural laborers 11 Stevedores 11 Syndicats 11 Communism 9 Labor leaders 9 Race relations 9 Economic conditions 8 Histoire 8 Industrial relations 8 Political activity 8 Iron and steel workers 7 Textile workers 7 Wages 7 Coal mines and mining 6 Newspapers 6 Printing industry 6 Brewery workers 5 less ...