The documentary pretty much tells us the names of some of the people involved with erecting the guidestones. The most important was William Shockley a Nobel prize physicist and inventor of the transistor, he was known as the father of silicon valley. He was a major eugenicist and worked for Bell Labs, which is part of the military industrial complex with ties to ALL the intelligence agencies.
Bell Labs was where Michael Paine the husband of Ruth Hyde Paine worked. He invented the Bell helicopter, and was "friends" of Lee Harvey Oswald and his wife. The Paines were also involved with channeling the Nine with Andrija Puharich in Maine during occult rituals. Anyways ill post the documentary.
I believe the local freemasons were involved, but probably just used to get the job done and keep quiet. I was wrong in my initial opinion, but still keep the opinion that R.C. Christian as alluding to the Rosicrucians, and those who watch the documentary will see why.