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Subject
- Police.2
- Riot control.[remove]2
- Anti-war demonstrations.1
- Cavalry.1
- College students--Political activity.1
- Communist Party of the United States of America (Mass.)1
- Criminal justice, Administration of--United States.1
- Demonstrations.1
- May Day (Labor holiday)1
- Peace movements.1
- Politics and society.1
- Protest movements.1
- Riot control agents.1
- Riots.1
- Students.1
- War and society--United States.1