I used to work for a Mormon and a Catholic who were both Scientology. Scientology own a management company that helps you run a small business. Our office was FULL of Scientology lingo. Some people even did E meter tests. Bizarre.
ST's greatest similarity with JW's is "disconnection". They "declare you a suppressive person". They call it a SUP for short. There is even a tribunal for it. Its the same thing as disfellowshipping.
I would HIGHLY recommend a book by a New Yorker staff writer called "Going Clear: Scientology, Hollywood, and the prison of belief." Reading it helped wake up my wife a bit. its facinating. JW's even get an honorable mention in the back along with some other religions regarding control etc....Its like a sentence......but still.
If you only read one book about Scientology.....that is the one.