The image of this fearsome foursome, echoed in more than a few flattering profiles, was as seductive as a Benetton ad. There was Tamika Mallory, a young black activist who was crowned the “Sojourner Truth of our time” by Jet magazine and “a leader of tomorrow” by Valerie Jarrett. Carmen Perez, a Mexican-American and a veteran political organizer, was named one of Fortune’s Top 50 World Leaders. Linda Sarsour, a hijab-wearing Palestinian-American and the former head of the Arab-American Association of New York, had been recognized as a “champion of change” by the Obama White House. And Bob Bland, the fashion designer behind the “Nasty Women” T-shirts, was the white mother who came up with the idea of the march in the first place.

What wasn’t to like?

A lot, as it turns out. The leaders of the Women’s March, arguably the most prominent feminists in the country, have some chilling ideas and associations. Far from erecting the big tent so many had hoped for, the movement they lead has embraced decidedly illiberal causes and cultivated a radical tenor that seems determined to alienate all but the most woke.

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Start with Ms. Sarsour, by far the most visible of the quartet of organizers. It turns out that this “homegirl in a hijab,” as one of many articles about her put it, has a history of disturbing views, as advertised by . . . Linda Sarsour.

There are comments on her Twitter feed of the anti-Zionist sort: “Nothing is creepier than Zionism,” she wrote in 2012. And, oddly, given her status as a major feminist organizer, there are more than a few that seem to make common cause with anti-feminists, like this from 2015: “You’ll know when you’re living under Shariah law if suddenly all your loans and credit cards become interest-free. Sound nice, doesn’t it?” She has dismissed the anti-Islamist feminist Ayaan Hirsi Ali in the most crude and cruel terms, insisting she is “not a real woman” and confessing that she wishes she could take away Ms. Ali’s vagina — this about a woman who suffered genital mutilation as a girl in Somalia.

Ms. Sarsour and her defenders have dismissed all of this as a smear campaign coordinated by the far right and motivated by Islamophobia. Plus, they’ve argued, many of these tweets were written five years ago! Ancient history.