The Soviet Union wasn't always the most friendly place for Jewish people.
But Jewish Autonomous Oblast man.
We like the Jews....as long as they all move to Siberia.
Interestingly, the Soviets openly floated the idea of creating the Jewish Soviet Socialist Republic in Crimea after the war, which was of course mostly a publicity stunt to impress the west (and it wouldn't work if ever attempted, just as the Jewish Autonomous Oblast). Then, when the foreign oriented-publicity stunt was no longer needed, Stalin used the idea to prosecute prominent Soviet Jewish figures for "nationalism".