Scientology leader David Miscavige has threatened file a lawsuit over a tell-all book written by his own father, Ron Miscavige, about the religious group. Last week, former literary agent and publisher Humfrey Hunter received a legal letter from the Church of Scientology threatening a lawsuit if he releases Ron Miscavige’s tell-all book on May 3. The said book titled “Ruthless: Scientology, My Son David Miscavige, and Me,” reveals the alleged dark secrets of church, The Telegraph details. Aside from Hunter, U.S. publisher St. Martin’s Press also received a similar letter from the legal representatives of the Church of Scientology, People reports. “You are now on notice of the highly defamatory content of the subject book. In the event that