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- Labor unions27
- Labor12
- Strikes and lockouts11
- Agricultural laborers9
- Hispanic American mass media7
- Collective bargaining6
- Congresses6
- Boycotts5
- Hispanic American agricultural laborers5
- Foreign relations4
- Hispanic Americans4
- Labor contract4
- Radio stations4
- Grapes3
- Labor leaders3
- Organizing3
- Political activity3
- Disappeared persons2
- Economic conditions2
- Elections2