The first book I read about this was Killing the Black Body, which detailed how slave bodies were handled (physically and by society) and then how that progressed into the eugenics movement that is still alive and well today.

From there it was just noticing it in the news whenever it comes up. Which is why I was hinging my statements on the frequency. I haven’t done any analysis, it just hits the news often enough that I’m disgusted.

Thanks to Thallamanond and Nathaniel for providing specific sources.