JOEL KOTKIN: The Changing Face Of Anti-Semitism.

When Donald Trump was elected president, much of American Jewish leadership reacted with something close to hysteria. To some, Trump’s presidency reflected the traditional face of the anti-Semitic right — xenophobic, nationalist and culturally conservative.

Trump’s handling of certain events, notably the Charlottesville white nationalist rally, have revived earlier charges that the president winks at right-wing racist supporters, even considering them part of his base.

The disdain toward Trump in the rabbinical community — often more liberal than congregants — was reflected in its cancellation of the annual New Year (Rosh Hashanah) call with the president. Yet, for all of the justifiable worries about the extreme right, the more consequential threat may well come from the left side of the spectrum.

The European model

I first became aware of this shift almost 15 years ago, when my wife, Mandy, and I visited the famous Nazi hunters, Serge and Beate Klarsfeld, at their offices in Paris. One would expect Serge, whose father died in the concentration camps, to focus his concern on aspiring brown shirts, but, instead, he suggested that the biggest long-term threats would come increasingly from the left and parts of Europe’s expanding Muslim immigrant communities.

Some Jewish groups seem slow to realize how much things have changed since 1940. To be sure, the rise of right-wing nationalism across Europe is frightening, but, increasingly, the primary locus of European anti-Semitism can be found in heavily Muslim communities around cities such as Paris, as well as in Europe’s universities, where anti-Israel sentiments are increasingly de rigueur.

Who could have seen that coming?