The FBI plants group leaders. It's always the same pattern. The Proud Boys leader also was a FBI informant.
https://www.reuters.com/article/us-usa-proudboys-leader-excl...
https://www.reuters.com/article/us-usa-proudboys-leader-excl...
I don’t think your example supports that. “Group leader was formerly an informant for both the FBI and local law enforcement” does not indicate “FBI planted him as group leader”.