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People demonstrating against American involvement in the Vietnam War... News Photo1970-1979,Aggression,American Culture,Archival,Black And White,Conflict,Confrontation,Crowd,Horizontal,Human Relationship,Law,North America,People,Police Force,Politics,Protest,Riot,Rock - Object,Street,Teaching,Throwing,USA,Vietnam,Vietnam War,Violence,War,Washington DCPhotographer Collection: Hulton Archive 25th May 1972: People demonstrating against American involvement in the Vietnam War throw rocks at the police during a demonstration in Washington DC. The police used tear gas to break up the demonstration and made mass arrests. (Photo by Keystone/CNP/Getty Images)