To me that sounds even more like an algorithm at work, and quite possibly one more concerned with identifying possible fake accounts than identifying political

To me that sounds even more like an algorithm at work, and quite possibly one more concerned with identifying possible fake accounts than identifying political violence (Relevant context: the SWP is tiny and inconsequential, but very active in coordinating its [unlikely to be violent] messaging and inflating its importance. Nobody would know who its "dozens of leading activists" were to target them. And its local group pages are still up and easily discoverable by searching, so if it was a deliberate action to silence the party it would be a very sloppy one)