Based on the stories of actual whistleblowers, what really happens is that they either get arrested or nothing happens. Unless OP has real firsthand knowledge of crimes and isn't just repeating information spread by other mentally ill people, I very much doubt something that was aired in a Netflix documentary is going to make the CIA follow him targeted-individual-style. If everything you are talking about can already be found online, you're not special. It's narcissistic.

There are plenty of laws on the books that can be used against people sharing classified information (whether or not they are effective is another question) so why would they need to follow you around and poison your food?

That's not to say that whistleblowers don't get followed, they certainly do but in an inconspicuous manner. Real intimidation comes in the form of two guys knocking on your door explicitly telling you to knock it off or else they'll arrest you, beat you, kill your dog, etc.