I recently finished reading an excellent book entitled: Churches That Abuse by Ronald M. Enroth. This book was an analysis of cultic Bible groups in the United States. Enroth spent years doing in-depth research and conducting interviews of former members. Interestingly, he does not once mention JWs. However, there are striking similarities.
One of the common threads in all of these cultic Bible groups was the ways in which they demonized former members. Several of the groups referred to former members as "apostates", "enemies of God", and "rebellious like Korah". All of these groups painted former members as liars who could not be trusted. Members faced disciplinary action simply for speaking to former members. Sound familiar??
Enroth provided several quotes from journals and newsletters published by these churches. Many of the quotes sounded as if they had been lifted directly from Watchtower articles.
The book was a great read. I highly recommend it.