The French Revolution and the blood-curdling violence it engendered terrified the ruling and propertied classes of Europe. Unable to grasp how such horrors could have come about, many concluded that it was the result of a devilish conspiracy hatched by Freemasons inspired by the ideas of the Enlightenment with the aim of overthrowing the entire social order, along with the legal and religious principles it stood on. Others traced it back to the Reformation...