Most of the prepper groups have informants or undercover agents who attend meetings. I used to attend one group. Had firefighters, off duty cops and so forth who seemed to be legit.
Also, had people who would spout off anti-govt statements advocating violence. Happened several times and they were usually asked to leave if they didn’t stop. IMO they were informants seeking to instigate.
"....Those are the ones you avoid conversating with. Just tell them you are not interested. Go no further that that.