Scientology Enemies List - Groups - 2017-09-05
In 1992, Scientology published a list of enemies it had at the time. On this list were hundreds of groups. Many of the people in these groups were once involved with Scientology and parted ways. It is very possible that there are more groups currently determined to be "suppressive" than actual active ones involved with Scientology.
The entire Scientology enemies list is here - http://www.xenu.net/archive/enemy_names/enemy_list.html
The book Blown For Good - 15 years at the headquarters of Scientology. https://www.amazon.com/Blown-Good-Behind-Curtain-Scientology/dp/0982502206