Conspiracy: How the Paranoid Style Flourishes and Where It Comes From

Was AIDS intentionally inflicted upon blacks by whites? Was JFK assassinated as part of an intricate conspiracy? Pipes traces conspiracy theories through history to show that "Conspiracism"—genuine and virulent belief in a conspiracy—dates back to the First Crusade and reached a peak in the Soviet Union and Nazi Germany, with the focus shifting from the Jews, groups such as Freemasons and the Rosicrucians, and back again.
—DanielPipes.org