There’s no doubt that Ms. Sarsour is a regular target of far-right groups, but her experience of that onslaught is what makes her smear all the more troubling. Indeed, the idea that Jake Tapper is a member of the alt-right is the kind of delirious, fact-free madness that fuels Donald Trump and his supporters. Troublingly, it is exactly the sentiment echoed by the Women’s March: “Our power — your power — scares the far right. They continue to try to divide us. Today’s attacks on #AssataShakur are the latest example.”

Since when did criticizing a domestic terrorist become a signal issue of the far right? Last I checked, that position was a matter of basic decency and patriotism.

What’s more distressing is that Ms. Sarsour is not the only leader of the women’s movement who harbors such alarming ideas. Largely overlooked have been the similarly outrageous statements of the march’s other organizers.