The Spear of Destiny by Trevor Ravenscroft documents the perversion of occult power by Adolf Hitler and the Nazis. Rudolf Steiner's emergence as a powerful spiritual enemy of Hitler resulted in an assassination attempt by the Nazis. Steiner did not approve of Crowley's magical systems, and Ravenscroft makes it clear that he abhors Crowley too. However, the secret incorporation of Steiner's Projective Synthetic Geometry in the Thoth Tarot by Frieda Harris - she took lessons from Olive Whicher in London - at the beginning of World War II points to the synthesis of powerful magical systems that helped bring down the Nazis.