You report finding hidden cameras, modifications to your computer, etc. But nowhere do you indicate what evidence you have that the agency of the federal government called the FBI is the culprit. Anyone can buy hidden cameras and use them to spy on people. Computer viruses modify your computer's software without your knowing. You offer no evidence that the FBI even knows who you are or is investigating you in any way. Without such evidence, no court could adjudicate in your favor on a Bivens claim, even if your civil rights had been violated in some way.
Not legal advice as I don't practice law in California. It's just my two cents on the facts you describe in light of general principles of law. If you need legal advice, please consult a lawyer who holds California licensure. That's not me.
Hiding in a mini bus is harassment. If the FBI has a search warrant to install hidden cameras or search your computer that is not harassment or civil rights violation. If the FBI intended to harm you with your job then you might have a claim but it is difficult sometimes to prove intent.
This is just my opinion and not a comprehensive answer. You assume the risk because this answer may not apply to your situation depending on the facts.