There are many beliefs that posit an international Jewish conspiracy, obviously not all of those may by applicable to you.
> I'm an ultra-progressive extreme leftist.
Antisemitism often exists in both left wing and right wing extremists groups, the international Jewish conspiracy beliefs likewise do as well.
> Class analysis can't explain this slavish attitude that nearly every world leader has to Israel.
It seems the opposite is true overall.[0]
> There's no intra-class conflict in Israel, all disagreements vanish into the ether and they close ranks as soon as they smell the opportunity to rid the world of what they view as the filthy, of the sheqetsim, of the abominable.
There are deep divisions within factions in Israel, to claim otherwise is to ignore reality.
[0] https://unwatch.org/2025-unga-resolutions-on-israel-vs-rest-...