I was looking through the George Van Tassel FBI release. So they guy was running a UFO cult out of "Big Rock Airport" in the desert near the 29 Palms artillery range. The FBI was a concerned it might be a front for recruiting and funding commies.
But this is where it got interesting…Tassel and a few others were distributing a pamphlet talking about how some engineers had completed the Tesla Set after Tesla's death and were in regular communication with aliens. This is from page 138 of the pdf. Workfagging now, will look through more later.