Embeddings are great for this, capture all posts by all people in the sub and embed them, then cluster users by their overall position and the distances between

Embeddings are great for this, capture all posts by all people in the sub and embed them, then cluster users by their overall position and the distances between their posts, etc, to profile them ideologically and single-issue wise, and then graph the links between similarly located users. Do they post in a web, or a tag-team way that differentiates them from other users? And then also color these by the average response time, etc. But don't rely on these types metrics because they're the easiest to avoid by simply delaying responses based on their length and complexity, plus a random discovery time, plus a time-of-day dependent offset. And then, potentially just issue warnings. "You've been detected participating in a brigading fashion, and bot or not, may be banned if this continues" and see what changes.