I had first heard of Scientology in about 1968. It was not very well known in that era. There was one critical book out that I became aware of in about 1969 and that was Paulette Cooper's book "The Scandal of Scientology". I was curious about it but was told by my new Scientology friends and staff members to not even think about reading it because 1. It was entheta and contained nothing but lies. 2. It contained material from Oat Tee level 3 and if you were exposed to it then you could not ever be audited by anyone other than an Oat Tee 3 auditor and it would wreck your case. I was interested as I said but I didn't want to wreck my case and so I never read it until years later after I had left the cult.