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So it seems that "white supremacy" is a catchall term for anything that argues a biological basis for group differences. Thank you for the links and for not just being aghast that I didn't know this. :]
https://rationalwiki.org/wiki/James_Damore#Sex_and_drugs_and...
RationalWiki has a very opinionated take on things, but that article is very well-sourced (75 linked sources!) so you can read right up.
Now, it could fairly be said that his pro-KKK arguments were more "glib humor" than endorsement and I'd agree. I would also say it's part of the pattern of negative workplace behavior that got him terminated.
In a larger sense, its these "oh, [group A] isn't performing as well as [group B]... must be biological differences" arguments that often form the faux-scientific basis for discrimination. Read any racist literature, and you will find a lot of "science" claiming that [insert racial group] here is biologically inferior. And, yes, that includes much Nazi propaganda.... justifications used by American slave-owners, etc.
Hell, those titles being cool without their association to the KKK is why the KKK used those titles.
So it seems that "white supremacy" is a catchall
term for anything that argues a biological basis
for group differences.
No, not quite.
It's just that their history is inextricably linked.
We can all agree that there is certainly much valid research to be done here. For example, why is sickle-cell anemia so much more prevalent in African-Americans? What biological adaptations allow some populations (Nepalese, etc) to thrive at high altitudes? Nobody finds that sort of thing objectionable.
However, things get ugly fast when we start talking about the study of why one group is best suited for one task or another, or which group is superior in general.
There is a long and sordid history of biological arguments in favor of the superiority of certain groups of people, typically white European males. It should not surprise you to learn that these arguments come from white European males.
Not all studies of "group differences" have anything to do with white supremacy, but every white supremacy movement that has ever existed has claimed a biological basis for their views.
We sort of fought a world war over this (among other reasons) and a lot of people died. These sorts of arguments have also been used to justify slave ownership (a rather large war was fought over this as well) and the oppression of women.
Wikipedia is a reasonable place to start