Topic: Secret Societies and Aliens
If you are going to have a secret society, then one of the biggest secrets that I think you can share among the top people in that society is definitive knowledge that aliens exist.
That could be a core piece of information that separates high level initiates from the masses.
Beyond knowledge of existence, there is access to the ability to create change (possibly through occult methods) and also access to advanced technology.
I think that William Bramley in "The Gods of Eden" and William Cooper in "Behold a Pale Horse" both did pioneering work in exposing a connection between aliens and secret societies.
There is also the popular media. As I mentioned in another post:
On the secret society aspect, it seems clear that a surface level will be/is being exposed. For example, I think the Da Vinci Code book has sold over 40 million copies and the movie will likely be seen by many.
"The Syndicate" - an elite group of international humans was a key part of the X-files. They were the ones managing the alien issue. There was the movie "National Treasure" which I think had a line about the pyramids being built by aliens.
For the definitive link to tie the aliens and the secret societies together, there is the classic line from the movie "Dazed and Confused" (1993, written and directed by Richard Linklater):
"George Washington was in a cult, and the cult was into aliens, man."