Maybe these people should get together and form their own authoritarian-left software foundation. Call it the People's Software Foundation or something. No Dang, I'm not being snarky. This is a legitimate suggestion.
But that's beside the point. I'm not saying anyone is unwelcome or should leave. In fact, I think it would be best if people could coexist in the same organization while agreeing to disagree.
But the fact of the matter is that these people already resigning. So instead of just doing nothing after they resign or working for some company, they should create their own group that's more in line with their ideals.
The authoritarianism is in the community, and the opinion held by many within it that one cannot be a member of the Free Software community and oppose the leadership of Richard Stallman or be critical of his behavior. Everyone who does so is regarded as a traitor, a shill working for the interests of the proprietary software establishment or a SJW spreading lies and false claims. I've already seen several comments calling for the removal of "the SJWs" from the movement, and praise for the community's intolerance of any view outside of its political orthodoxy.