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Queer people have clashed with police throughout history. This continues today with higher rates of police presence at LGBTQ2+ events where attendees are more likely to face unjust treatment and harassment from the officers.
A group of queer and trans people of colour blocked the parade to voice their concerns and hand out leaflets listing the changes they would like to see. This list included demands such as uninviting the RCMP, military, and police forces from marching in future parades, that more support and voice be given to queer and trans people of colour, as well as clear acknowledgment of the historical police oppression towards the queer community at all Pride events.
Edmonton did not cancel Edmonton Pride. The Board of Directors, who are all volunteers, decided they didn't want to donate their free time, because of the toxic environment. Fact: you treat volunteers like garbage, they leave (as is their right).