>>514174452
After the Molotov-Ribbentrop pact, most of them (which didn't get purged in 1937-38 since they resided in Poland) fled to the Soviet occupation zone and later returned, to speak colloquially, "on Soviet tanks" . And it's not like Stalin was an anti-Semite all his life, it was with his approval that Czechoslovakia sent arms to Israel in 1948 which proved crucial in Jews winning their independence war against the Arabs. Only after the Jewry went with the West had he truly become an anti-Semite, and he didn't even remove Lazar Kaganovich from his post.