This isn’t a conspiracy theory. I’ve seen them. They are here.
Even more alarming, it is an "in-your-face" operation by those anti-MAGA totalitarians that control our current WH admin - Biden may or may not be in the loop.
They know how many "entrants" will be adequate to create sufficient national chaos for their agenda; fewer if they are well trained. At the same time, they will carefully avoid a number that could conduct a serious invasion.