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Depiction: Thousands on people fill a street in Berkeley. They march in protest over People's Park. It is aereal view of the city looking down to the people who cover many blocks. Photo caption reads: "Thousands march along Oxford Avenue in downtown Berkeley Memorial Day to protest closing of a People's Park by University of California officials. On the right is entrance to the university. More than 2,000 National Guardsmen and police were on hand, but there was no trouble. On May 15 a bloody riot in Berkeley prompted the governor to bring in the National Guard.