To intimidate Ken White? I have to imagine there are easier targets to intimidate than a former USDA. Then again, I'm confused why they sent these to begin with.
Also, if I were trying to intimidate people who read a lot of Ken White's opinions, I wouldn't try to do it by filing questionable legal things about Ken White, thereby forcing him (as you say, a former USDA with a wide network) to enter into legal proceedings with me and inviting him to discuss my actions to his audience.
To a first approximation, that seems like it has a high likelihood of backfiring.