WASHINGTON (JTA) — The lawmakers thanked the representatives from the social networks giants for attending the Capitol Hill hearing on antisemitism — after all, it was not an official congressional hearing and no one was obliged to turn up.

But then, after some tense exchanges last Friday, things got acrimonious quickly: Rep. Debbie Wasserman Schultz, the Jewish Florida Democrat who convened the hearing, said that the tech reps’ stonewalling on whether and how antisemitism would be treated will lead to congressional action.

“We’re all starting to see — anyone watching this — w...