Greys use Telepathy, which can be easily blocked by making a helmet and lining it with 13 interwoven Layers of Gold / Lead. The foil can be brought online, it is thins sheets. The Helmet must over the brain and the front of the Helmet must cover the forehead to the eyebrows and cover the side of the head as well.
Just be aware that this isn’t the only group using telepathy, there is organic telepathy as well as synthetic telepathy. There are a variety of governments, organizations and private companies that have perfected it or are close to it. There are good guys with access to the same technology, luckily it isn’t all psychopaths.
There are also visualization techniques that take back control of your own electromagnetic biofield and use that as a barrier. Fuck google, use yandex, look up Sabrina Wallace.