Baseless accusation. The protests are mostly in the blue-voting cities, and the GP's list is representative.
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Here is how it works:
Minneapolis, Chief of Police: nominated (...) by the Mayor of Minneapolis (Betsy Hodges) [1]
Seattle, Chief of Police: [n]ominated by Mayor Jenny Durkan [2]
St Louis, Comissioner of Police: appointed as the 35th Commissioners of the St. Louis Metropolitan Police Department on December 28, 2017 by Mayor Lyda Krewson [3]
Atlanta Chief of Police: Mayor of Atlanta Kasim Reed announced on December 1, 2016, that he had chosen Shields [4]
Chicago Superintended of the Chicago Police Department: The City Council on Wednesday voted 50-0 to appoint former Dallas Police Chief David Brown to lead the Chicago Police Department [5]
Oakland Chief of Police: Oakland Mayor Libby Schaaf announced Monday that she has appointed former San Mateo Police Chief Susan Manheimer as Oakland’s interim police chief [6]
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[1] https://en.wikipedia.org/wiki/Medaria_Arradondo
[2] https://www.seattletimes.com/seattle-news/politics/carmen-be...
[3] https://en.wikipedia.org/wiki/John_Hayden_Jr.
[4] https://en.wikipedia.org/wiki/Erika_Shields
[5] https://news.wttw.com/2020/04/22/david-brown-confirmed-chica...
[6] https://www.sfchronicle.com/bayarea/article/Oakland-Mayor-ap...