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Generally speaking I think gangstalking is too broad of a subject to be able to say whether it's real or not.
There are lots of schizos, people with overactive imaginations, and people who have good reason to be paranoid but then see a secret agent behind every bush.
That said, it's a technique to intimidate, unsettle or stress someone out without much risk, and it almost certainly happens. Who is responsible probably varies a lot.
Personally, I've had several things happen I'd consider quite odd, but since I'm not important and don't know anything useful I'm skeptical of some conspiracy against me.