Jehovah's Witnesses have a gang stalking / mob tactic practice that is more intrusive than Scientology.
JW go door to door and will defiant trespass by sending minor children or old sister flakey to knock on your door to make you nervous or just gather intell. If I was Scientologst # 1 mortal enemy they could not so much as sit in a parked car on my suburban street without the neighbors calling the cops in 5 mins.
My neighborhood has children day care businesses on BOTH sides of my house and no creepy strangers can come close even the FBI would get given away.
JW CAN go on my street and write down info about you on a notepad in plain sight and not get challenged.
Just my observations.