After they use violence to discipline their own side, everything gets much more serious. But it's also a point of risk for them, because it might break their coalition. So it's important to defend the rights even of those who are on the side of autocracy . Because if they are successful in establishing violence as their right over even their own allies and followers, there may be no way back without civil war.
At first jail, where they release them after a day or two, then in warehouses converted into jail-hospitals, where people stay weeks, get treated, sometime lose teeth. Almost always syndicalists and KPD supporters, sometimes SPD local leaders, it was often political?
Oh sorry, you talked about the US?
I would say, when the administration openly refuses to follow a court decision. (And in practice, it's going to have to be a Supreme Court decision, because the administration seems to appeal every lower court decision that is against them.) Or, when they openly and blatantly interfere in the 2026 election (either by cancelling it via martial law or state of emergency, or interfere in it via troops or ICE in the streets or state of emergency, or after the fact refusing to accept the results because of some claim of invalidity).