The illuminatus originated in a trilogy of books from the 1970s that developed somewhat of a cult following. (The subversive cult that infiltrated the illuminatus were known as the "ancients of My Mu"). To understand the resurgence of this concept, look into "operation mind fuck". A free-form art project–cum–prank–cum–political protest of the sixties and seventies, designed to sow the culture with paranoia.
Although it's more than probable that the world is actually under the control of the super rich, that's really not much of a secret. America is (quite obviously, to anyone who cares to look beyond the smokescreen of propoganda and mainstream media censorship) no longer the democracy it purports to be. It's been a fully fledged corporatocracy for some time and most of the western world (at least) is hot on its heels.
As has already been pointed out, the present concept of the "illuminati" complete with human sacrifice, reptilians and adrenochrome
, is antisemitic nonsense. For the truth about adrenochrome, see the attached article.