Was The Grinning Man a visitor from Lanulos — or was something far darker hiding behind the disturbing smile?

Was The Grinning Man a visitor from Lanulos — or was something far darker hiding behind the disturbing smile?
Who were the shadowy men in black who stalked UFO researchers after the Rendlesham Forest incident — and what secrets were they so desperate to keep buried? What connects a deadly UFO encounter on Maury Island in 1947 to shadowy men in black and decades of chilling threats against those chasing the truth?