You would know it if you were a gang stalking target. It's a lot more than just being under surveillance-- that's the tip of the iceburg. Theres a lot of people on youtube that have videos of people at the grocery store saying they are poisoning food, or people yelling at cars, just people acting crazy in general. The people that do the stalking put these videos out there to discredit the legit claims of people being harassed 24/7. When you move, people in the area you move to continue the stalking. This stuff happens everywhere in the country and most of the world. They use slander campaigns and tell lies about the target, but the target is never given an opprotunity to tell his/her side of the story. They will break into your house and move stuff. Cars driving near you will constantly flash their high beams at you. Cars will drive by your house honking several times per day. They do stuff that they think will get to you, but will make you sound crazy if you explain to someone what is happening.

It's damn hard to catch them this is the closest thing to "proof" I have found