I guess when it says "soviet dictators" it means "dictator of the Soviet Union", not "soviet, and dictator of whichever country"... otherwise I'm a professional soccer player in Europe, because I play soccer, I live in Europe and I have a job
Given that 85% of people managed to get at least Ron I'd say the Weasleys are well known enough to be considered general knowledge even if you don't personally know it. If literally everyone had to know something to be classed as general knowledge then quizzes would be pointless because everyone would get 100% every time.
I too had never heard of them; the reason I only got Ron was simply due to typing in random names. After looking them up I now understand why a lot of people HAVE heard; popular culture is not my thing!
Calling Gorbachev a dictator is a bit of a stretch, especially when Putin would easily qualify despite the current veneer of ever-vanishing democracy in Russia.
He had the same powers as those before him so dictator is valid. That he saw things couldn't continue as they were puts him into the "benevolent" dictator class