First of all, the Masonic conspiracy theories are total BS. Anyone that tells you that Masonic organizations are evil or Satanic needs a reality check.
I saw the movie Angels and Demons with Tom Hanks, and there were references to the Illuminati. I've heard other stories that they were a secretive Satanic organization, but I don't trust those stories at all.
Are the Illuminati conspiracy theories based on any fact at all? Who were (or are) they?