tl;dr There's a paranoid conspiracy belief, popular among White Nationalists, that a secret Jewish organization is shaping policy worldwide to make the "White race" extinct - through interracial marriage, immigration, etc.
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We've seen far-right demagogues particularly working a classic propaganda strategy in the past decade:
Accuse the opposition of the very abuses these demagogues themselves perpetrate. For example, chronic claims of election fraud favoring Democrats, while the actual evidence of genuine election fraud points overwhelmingly at Republicans. Literal Nazis marching to threaten and intimidate locals in Columbus OH, then turning around to claim they (the marchers) were threatened with firearms and attacked with thrown debris.
What I'm saying is - what if the extremist-fascist myth of an anti-white consiracy is yet another not-very-creative projection, namely of a White Nationalist conspiracy to concentrate Jews in Israel, and keep Zionists and Islamists at each other's throats while these White Nationalists cook up another "Final Solution".
Of course it's an absurdly silly theory, one I made up with minimal effort and zero evidence, but no more stupid than the extremist White Nationalist "white genocide" "theory".