Is Jeremy Corbyn an anti-Semite?

That is the question that has dogged British politics since Mr. Corbyn became the Labour Party leader three years ago. It’s also dominated every Shabbat dinner conversation and the WhatsApp thread of every Jewish family across Britain.

I didn’t want this to be true. Though the Anglo-Jewish community is increasingly Conservative, my Jewish friends and I are almost all Labour voters. That fact makes us close cousins of American Jews, who, as the saying goes, earn like Episcopalians but vote like Puerto Ricans.

As Jewish Labourites, we draw inspiration from a tradition that harks back to the Battle of Cable Street in 1936, when the left turned out in force to defend the Jews from Fascists on the streets of London. We all left university a decade ago dreaming of one day working in Labour politics.

But for the past several months, as scandal upon Jew-hating scandal has washed up at Jeremy Corbyn’s door, our parents and aunts and uncles have insisted that we were being loyal to a party that no longer wanted anything to do with us. Some friends began to leave Labour.