I don't know but... To me what is happening to many black Americans sounds and looks a lot like what happened to the Jews in Germany: Being pushed into gettos, marginalized from society, being incarcerated at much higher rates than everyone else (even though it has been proven that blacks are as likely to commit a crime as anyone else), et cetera.
I think the USA learned a lot from Hitler and his reign of terror. Mainly that repression is more effective when carried out in a low-key, gradual manner. And this is what is going on right now.