Series of shots of demonstrations against Vietnam war in streets of Chicago during the Democratic National convention; shots of people in streets, of police and traffic. Shots of banner reading "A PLAGUE ON BOTH YOUR HOUSES" hung over entrance of convention hall. Various shots of protesters leaning forward with hands against wall as riot police frisk them (2:05). Daylight shots of large crowd of protesters in streets, television mobile unit is visible in crowd. PANs of riot police lined up along park (1:10).