Gang stalking or group-stalking is a set of persecutory beliefs in which those affected believe they are being followed, stalked, and harassed by a large number of people.[1] The term is associated with the "targeted individual" ("T.I.") virtual community formed by like-minded individuals who claim their lives are disrupted from being stalked by organized groups intent on causing them harm
Not sure if you knew that or thought it was an insult.
But it's highly relevant and people experiencing this can benefit from seeing that it is a relatively common thing that can manifest from paranoia. Just being aware of it can help break them out of it.