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- Labor unions21
- Hispanic American agricultural laborers18
- Boycotts12
- Grape industry8
- Radio stations8
- Hispanic American mass media7
- Lettuce industry4
- Agricultural laborers3
- Strikes and lockouts3
- Elections2
- Law and legislation2
- Newspapers2
- Political activity2
- Public radio2
- Anniversaries, etc1
- Civil rights1
- Civil rights demonstrations1
- Cooking, American1
- Cooking, Latin American1
- Cooking, Mexican1