(JTA) — Within two weeks, a series of Bay Area billboards equating anti-Zionism with antisemitism were targeted by activists. In the first incident, an unknown group of culprits wrote “Free Palestine” on them, leading the billboards’ sponsor to replace them and call the graffiti “a hate crime.”

The second time they were targeted, a group of Jews took the credit.

On Tuesday night, a group of self-proclaimed “anti-Zionist Jews” papered over three billboards paid for by the New Jersey-based group JewBelong. It was a further escalation in a national debate over anti-Zionism, ant...