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Long time investigative journalist Joe Domanick writes about this checkered history in Blue: The LAPD and the Battle to Redeem American Policing
My conversation with Joe Dominick:
"To discover to the world something which deeply concerns it, and of which it was previously ignorant; to prove to it that it had been mistaken on some vital point of temporal or spiritual interest, is as important a service as a human being can render to his fellow creatures..." John Stuart Mill, "On Liberty"