Document and save anything they send to you. If this goes any further you can defend yourself with the fact that they're harassing you which resulted in emotional distress and the inability to do your job.
They're being so vicious with suing because they KNOW that if their info got out they would be shut down. Thanks for doing your job, USDA/ FDA =(.
They spy, huh?
Hmmmm.
Hey PPP. Suck it.