Here are some things that you will hear when you sit down to dinner with the vanguard of the Intellectual Dark Web: There are fundamental biological differences between men and women. Free speech is under siege. Identity politics is a toxic ideology that is tearing American society apart. And we’re in a dangerous place if these ideas are considered “dark.”

I was meeting with Sam Harris, a neuroscientist; Eric Weinstein, a mathematician and managing director of Thiel Capital; the commentator and comedian Dave Rubin; and their spouses in a Los Angeles restaurant to talk about how they were turned into heretics. A decade ago, they argued, when Donald Trump was still hosting “The Apprentice,” none of these observations would have been considered taboo.

What is the I.D.W. and who is a member of it? It’s hard to explain, which is both its beauty and its danger.

Most simply, it is a collection of iconoclastic thinkers, academic renegades and media personalities who are having a rolling conversation — on podcasts, YouTube and Twitter, and in sold-out auditoriums — that sound unlike anything else happening, at least publicly, in the culture right now. Feeling largely locked out of legacy outlets, they are rapidly building their own mass media channels.

But they all share three distinct qualities. First, they are willing to disagree ferociously, but talk civilly, about nearly every meaningful subject: religion, abortion, immigration, the nature of consciousness. Second, in an age in which popular feelings about the way things ought to be often override facts about the way things actually are, each is determined to resist parroting what’s politically convenient. And third, some have paid for this commitment by being purged from institutions that have become increasingly hostile to unorthodox thought — and have found receptive audiences elsewhere.