Photo-Illustration: Intelligencer; Photo: Getty Images In 2003, the Southern Poverty Law Center warned of a “bizarre” label gaining popularity with the right. “Cultural Marxism” was everywhere, according to believers. Pat Buchanan thought it was so powerful that it could “de-Christianize” America, and William S. Lind, the former director of the Free Congress Foundation, said it was turning colleges into “ivy-covered North Koreas.” The SPLC warned that cultural Marxism, as a narrative, promoted antisemitic falsehoods about a cabal composed of Jewish intellectuals — “nefarious, communistic destroyers” of the American way of life. Years later, cultural Marxism is still in the news....