Rational, the Satmar is a Jewish movement that is ferociously anti-Zionist and teaches that Zionist Jews will burn in hell and the like. Their rebbe in Hungary taught his followers in the 1940s that it was their duty to stay in Europe and face the Nazis as part of their fate, but he himself fled to refuge in the United States.
You might know the Satmar today as Neturei Karta.