Some ideas have a tendency to survive in the minds of people, no matter how many times they are proven wrong. The economic nationalism, under the name of self-sufficiency or autarky, has not been a new concept. The idea dates back at least to the era of Mercantilism of the French monarchy under Louis XIV.
The stereotype that Jewish people are rich and greedy, and that they corrupt non-Jewish people, is an important factor of far-left antisemitism. The Soviet Union had a long history of antisemitism, often masked as anti-Zionism or anti-cosmopolitanism.