Churchill was white, therefore, it follows that he was a white supremacist. Whiteness is now illegal. Critical race theory proves it. Get use to it.
Note that he was a good war-time leader against the Nazis, but he was responsible for the failure at Gallipolli instead of listening to DH Lawrence and attacking near Antioch. he was also obstinate causing the Indians to push for independence.
He wasn't a "white" supremacist as he was part of the British creation of concentration camps where white Boers (Dutch origin people) were starved and kept.