The Illuminati is actually a real historical secret society that was formed in 1776, the same year the US declared it's independence. This is accepted history by mainstream scholars, so.. Uhh.. The Illuminati is not a conspiracy theory, it's a real group that existed historically. Some people believe it does still exist, that you could call a conspiracy theory cause most scholars do not believe they are still around.. Though that doesn't mean there aren't plenty of real secret societies out there.
During one of the US presidential elections we had two admitted members of Skull and Bones run against each other! Kerry and Bush. In fact, the deeper you get the more you find out how real a lot of this stuff is. Some stuff cannot be proven, I won't claim I know the answers to JFK's assasination or 9/11 or whatever.. But you can historically and now modernly prove the existence of many different secret groups. They have admitted their existence, even if they keep their meetings and rituals secret.. And then there's the secret groups we don't even know about.. But.. Anyways. Just thought I'd add a lil perspective.
Yeah I do know that it was a real thing, I was more meaning the whole ideas surrounding the Illuminati. Plus I'm not saying it isn't true, but it is technically a conspiracy theory.