Recorder history. "Scientifically proven" using pseudoscience to justify the 'need' to oppress. They published that shit, bless them. Legally codified. Videoed. Sung about. Joked about. Written extensively about. Preached about.
As long as there have been any kind of records, pretty much, the oppression has been documented.
But, you know, he needs to remain "objective" or whatever.