Lots of crypto-Jew infiltrators in the Orthoschismatic priesthood.
If you ever go to any Orthoschismatic forum, and you mention anything factual about Jewish crimes or their abominable treatment of Our Lord, or you express skepticism for the "6 million Jews - gas chambers" narrative, you will receive wailing and moans from these priests as you're banned. What immediately follows is the "you're an anti-semite" charge.
Jews know that these nations, whose religion is Eastern Orthodoxy, are inherently nationalistic. The Jew has aimed its claws at these people in order to slash away these peoples' inherent love for their identity, family traditions, nation, culture, and their love for Our Lord, albeit they are schismatics. The Jew knows that Eastern Orthodoxy's roots of opposition to world Jewry is the same roots as Catholicism. In essence, it's Jesus Christ vs Antichrist.