Well I could throw out a number of examples, any of which you may reasonably disagree with and all of which are by necessity controversial, so I don't think the

Well I could throw out a number of examples, any of which you may reasonably disagree with and all of which are by necessity controversial, so I don't think there's value in steering the conversation in that direction. But asking for a specific example is rather missing the point - we are discussing the idea of censorship, not the merits of any individual controversial claim or figure. We don't know which examples of ideas being censored will be looked back at years from now as times when the truth was trampled on. And since we can't know, we can't afford to censor, no matter how convinced we are today that something is a lie or BS. For the sake of not dismissing your question entirely though, even though I believe it's not the right question to ask, I'll offer up the covid lab leak theory and everyone who argued in favor of it. Decried as a racist conspiracy theory and actively censored from social media for over a year, but now accepted as at least plausible, even probable.