Hmm the Spacers? The Pirates and the Spacers are different factions and the Pirates are VERY lazily "anarchist". Aesthetics only pretty much, they rob and pillage pretty much everyone, they're as good as bandits, they basically are. They do carry guns around on them with "no gods no masters" and anarchy symbols on them, there's also some orders you can pick up from their leader that have extremely nominal "they think they own it all but they don't, it's ours" types of motivations. Paper thin nod to anarchism. Mostly dogshit.

I do genuinely think modding can fix much of this though. And there's a huge giant void begging for communists to be added, potentially space soviets. You could do an alt-timeline where the USSR still existed and they had an anticapitalist space war that ruined the galaxy instead. This would have been a better backstory for most of the lore tbh.