Labor policy Industrial relations 30 History 23 Labor supply 16 Labor unions 16 Working class 14 Economic policy 8 Manpower policy 8 Unemployment 8 Congresses 7 Political activity 7 Labor economics 6 Labor market 5 Occupations 5 Trade-unions 5 Wage-price policy 5 Collective bargaining 4 Labor 4 Unemployed 4 Economic conditions 3 Labor movement 3 Mathematical models 3 Social policy 3 Strikes and lockouts 3 Vocational education 3 Employee participation 2 Full employment policies 2 Human capital 2 Income maintenance programs 2 Industrial policy 2