At a recent working lunch, Renee Fellman was told that someone wouldn’t network with her because she’s Jewish. Fellman, who’s a corporate turnaround consultant based in Portland, Oregon was stunned — not by the mere existence of antisemitism, she said, but that her brush with it was so overt. “I doubt there’s more antisemitism now than 10 or 20 years ago,” said Fellman, who previously had more subtle or difficult to interpret experiences of discrimination, such as snubs. “People are just expressing it. It’s become OK to say it.” Across American culture, politics, and even business, expressions of antisemitism have...