sentences:  He speculated in a June 1949 letter to Germer that his clearance was revoked in response to his public dissemination of Crowley's "Liber OZ", a 1941 tract summarizing the individualist moral principles of Thelema.Declassified FBI documents later revealed that the FBI's primary concern was Parsons' former connections to Marxists at Caltech and his membership of the also "subversive" ACLU.When they interviewed Parsons he denied communist sympathies but informed them of Sidney Weinbaum's "extreme communist views" and Frank Malina's involvement in Weinbaum's communist cell at Caltech, which resulted in Weinbaum's arrest for perjury since he had lied under oath by denying any involvement in communist groups.