The war between Israel and Hamas has brought a crisis between progressive Democrats and the party headed by President Biden fully into the open. As progressives have racialized the conflict into “white” Israelis oppressing “brown and black” Palestinians, a look at the trajectory of the British Labour Party is instructive. Buoyed by Muslim immigration, Britain and now the US are beset by antisemitic electoral politics and threats of violence. And just as this phenomenon has helped sideline the British Labour, it may in the near future undermine the Democrats.