Cartels.
It is not the cartels, and it is not threats. DSS, Marshals, and SS could secure them in their homes, even make their neighborhoods gated communities, temporarily.
They are getting hit with the Havana Syndrome, and it is near impossible to tell where it is coming from due to the nature of the tech. Some think it is using some kind of new physics, maybe scalar waves. But since they can’t get a blanket warrant to tear apart all the houses in the neighborhood looking for emitters buried in walls, they are just pulling them out to a place the government can secure for some distance in each direction.
People do nto understand, the war is not against leftists. What you are looking at, in those “radicals” are actors and assets owned by an oppositional force that has spent decades at least embedding itself in government and the intel agencies. And now it seems to have worked it so it’s intel apparatuses are self-funded, and self-perpetuating. There is a real war right now in the intel community.