Zionism accuses Jews of dual loyalty because it claims Israel is the country of all Jews - not their counties of residence. As Israel's own government admits: "The term 'Jewish state' refers primarily to nationality ... Israel is to the Jewish people what France is to the French people, Ireland is to the Irish and Japan is to the Japanese."
That's Zionism. Without Zionism, Israel is to the Israeli people what France is to the French (both Jewish and gentile) etc. This anti-Semitic dual loyalty trope is inherent in Zionism, and Adolph Hitler knew it.