> Let's talk about Germany, to give one example. In that country, the top court can outright declare political parties illegal, if it believes that they constitute a threat to the democratic order.

So what? Which country can't declare organisations illegal, if it determines them to be terrorist organisations? I'm pretty sure the USA can. So what does it matter if a terrorist organisation calls itself a "party"? (Didn't the Symbionese Liberation Army try exactly that?)