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Police hustle along an unidentified man during a wild scene early today when thousands of young people combined a Salute to Spring Festival with a demonstration against the Vietnam War. Scores were treated for injuries and dozens were arrested. March 23, 1968. (Photo by Jerry Engel/New York Post Archives /(c) NYP Holdings, Inc. via Getty Images)

Police hustle along an unidentified man during a wild scene early today when thousands of young people combined a Salute to Spring Festival with a demonstration against the Vietnam War. Scores were treated for injuries and dozens were arrested. March 23, 1968. (Photo by Jerry Engel/New York Post Archives /(c) NYP Holdings, Inc. via Getty Images)