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- Political activity[remove]36
- College students25
- College buildings16
- Earth Day16
- Small groups16
- Universities and colleges16
- Wayne State University16
- Labor unions11
- Demonstrations10
- Picketing10
- Posters, American9
- Protest movements4
- Students3
- Vietnam War, 1961-19753
- Employment2
- History2
- Minorities2
- Strikes and lockouts2
- Unemployment2
- Automobile industry1