1971 Vancouver, British Columbia, incident also known as “The Battle of Maple Tree Square,” described by a commission of inquiry as a police riot, during which police attacked a peaceful Yippie smoke-in protesting a series of special operation marijuana arrests. Police used horse-back charges on crowds of onlookers and tourists, and were accused of tactics including indiscriminate beatings with riot batons. The event is commemorated in a two-story-high 2009 photo mural by Stan Douglas.

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