Not just "white supremacy" - though that is among the more prevalent forms because those living in the western half of the Eurasian continent perfected this concept over centuries - but the very corrupt idea that some people are just inherently better than other and everyone else should pay deference to them.
I had been calling this "conservatism", but I fear that's both too abstract and too inflammatory.
Especially when so-called "leftists" often fall into the same corrupt thinking.