The old anti-Semitism was mostly, but not exclusively, a tribal prejudice expressed in America up until the mid 20th century most intensely on the right. It manifested itself from the silk-stocking country club and corporation (“gentlemen’s agreement”) to the rawer regions of the Ku Klux Klan’s lunatic fringe.
While liberals from Joe Kennedy to Gore Vidal were often openly anti-Semitic, the core of traditional anti-Semitism, as William F. Buckley once worried, was more rightist. And such fumes still arise among the alt-right extremists.
Yet soon a new anti-Semitism became more insidious, given that it was a leftist phenomenon among those quick to cite oppression and discrimination elsewhere. Who then could police the bigotry of the self-described anti-bigotry police?
The new form of the old bias grew most rapidly on the 1960s campus and was fueled by a number of leftist catalysts. The novel romance of the Palestinians and corresponding demonization of Israel, especially after the 1967 Six-Day War, gradually allowed former Jew-hatred to be cloaked by new rabid and often unhinged opposition to Israel. In particular, these anti-Semites fixated on Israel’s misdemeanors and exaggerated them while excusing and downplaying the felonies of abhorrent and rogue nations.
Indeed, evidence of the new anti-Semitism was that the Left was neutral, and even favorable, to racist, authoritarian, deadly regimes of the then Third World while singling out democratic Israel for supposed humanitarian crimes. By the late 1970s, Israelis and often by extension Jews in general were demagogued by the Left as Western white oppressors. Israel’s supposed victims were romanticized abroad as exploited Middle Easterners. And by extension, Jews were similarly exploiting minorities at home.