According to  Professor Andrew Prescott, how long has antisemitism gone together with anti-masonry?
Professor Andrew Prescott of the University of Sheffield writes: "Since at least the time of the Protocols of the Elders of Zion, antisemitism has gone hand in hand with anti-masonry, so it is not surprising that allegations that 11 September was a Zionist plot have been accompanied by suggestions that the attacks were inspired by a masonic world order".