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- Labor unions17
- Hispanic American agricultural laborers14
- Boycotts11
- Grape industry6
- Lettuce industry4
- Radio stations4
- Agricultural laborers2
- Elections2
- Hispanic American mass media2
- Law and legislation2
- Newspapers2
- Political activity2
- Anniversaries, etc1
- Civil rights1
- Civil rights demonstrations1
- Cooking, American1
- Cooking, Latin American1
- Cooking, Mexican1
- Cooking, Spanish1
- Hispanic Americans1