Theodor Adorno and Max Horkheimer were unorthodox Marxist academics and German Jews.
In the early 1930s, like others of their sort who could, they fled Nazi Germany for the USA. And they reported that, in ordinary day-to-day life, they encountered more anti-semitism in the USA than they ever had in Germany.
In other words, the idea of anti-semitism as something far away and long ago, unfortunate but solidly dealt with by the gallant World War 2 allies, is false.
A recent report shows that anti-semitism is on the rise in Britain today.