Eastern Europe was a hotbed of violent antisemitism since the late 19th century. I'm half Jewish and my ancestors came to the USA for two reasons: opportunity + lynch mobs would kill them if they remained in Eastern Europe. As an example, I think on Wikipedia I read that the Black Hundreds would pull out people's tongues. Some family lore has survived about the Cossacks being vaguely bad.

A book that really put things into perspective to me was Abram Leon's The Jewish Question. I haven't read the whole thing and it was written by a Trotskyist (who risked his life as an organizer and was killed by the Nazis) but the thesis seems pretty solid to me. Why, the author asks, did Jews survive the Middle Ages while other ethnic groups were assimilated? Leon argues that Jews were necessary to feudalism as moneylenders (since the New Testament forbids lending money while the Old Testament specifies that Jews can lend to the goyim); once capitalism began destroying feudalism, once the ruling class figured out that they didn't need Jews to lend money, Jews were either expelled, assimilated, or exterminated. The vast majority of American Jews I know are non-practicing because capital has no need for us to practice our faith, but it seems like these days capital has found a better use for some Jews, at least, as the colonial occupiers of Palestine, though the majority of the world's Jews do not live in Israel.

This wasn't really your question, though. "Sir, this is a Arby's." I think Maus might be what you're looking for, if you haven't read it. The race reification there is weird and the Soviets have zero presence—Jews are mice, Germans are cats, Poles are pigs, Americans are dogs, the French are frogs, but Soviets apparently don't exist, even though the story takes place in Auschwitz, which was liberated by the Soviets. (The hero of the story, the author's dad, was death-marched out of Auschwitz before the Soviets liberated it IIRC.) The funny thing about the author is that, although he's a lib, he was publicly against the Iraq War, which meant that he was basically erased from the corporate press—until relatively recently, when some chud school board decided to get rid of his books, and libs decided they would own the chuds by buying Maus and displaying it on their coffee tables. A relative of mine knows his wife and says she's not nice. Anyway, Poles are definitely in Maus. Some help the main character, and some help the Nazis.

Although The Pianist was directed by a sexual predator, I think it's a really great movie, and it takes place entirely in Poland during the Holocaust. Spoiler alert, it libs out at the end—the main character is helped by a good Nazi who later dies in a prison camp because of those nasty Soviets—but otherwise I think it's fantastic, and it also shows some Poles risking their lives to help Jews, while other Poles go out of their way to harm them.