John Robison 
Proofs of a Conspiracy [EPUB ebook] 

In this work, Proofs of a Conspiracy, Robison laid the groundwork for modern conspiracy theorists by implicating the Bavarian Illuminati as responsible for the excesses of the French Revolution. The Bavarian Illuminati, a rationalist secret society, was founded by Adam Weishaupt in 1776 in what is today Germany. They had an inner core of true believers, who secretly held radical atheist, anti-monarchist and possibly proto-feminist views, at that time considered beyond the pale. They recruited by infiltrating the numerous (and otherwise benign) Freemasonic groups which were active at the time on the continent. Necessarily they had a clandestine, compartmentalized, hierarchical organizational form.