Hitler's ideology, the Third Reich, was predicated on the idea that the Aryans, the Germans, were a master race and the Jews were a subhuman race. It was a racialized anti-Semitism, now that might not fit exactly or feel different than the way we think about race in 21st century America, where primarily it's about people of color, but throughout the Jewish people's history, they have been marginalized, they have been persecuted, they have been slaughtered, in large part because many people felt they were not just a different religion, but indeed a different race.