Jehovah's Witnesses were sent to Concentration camps before the Nuremburg laws, their persecution began in 1933 when their refusal to give a Nazi salute lead to their doom.
That said they are pests when they knock on your door and if busy I just dismiss them otherwise I use logic which confuses them. I give them hope when I admit I am a deist, then dash it with my beliefs that God doesn't give a fat rat's behind whether you believe in a God or just live a good life.
I then ridicule there religion, especially the Jehovah's Witnesses believe that exactly
144,000 faithful Christians go to heaven as spirit creatures to rule with Christ who I consider a prophet and not divine, they usually leave at that point.
Mormons are fun also; my respect for the prophet Joseph Smith encourages them and my disrespect for his successor Brigham Young dashes their hopes; but Mormons have a past prone to violence and easily discouraged.
You must know something about the benign religion whether Seventh Day Adventists, Society of Friends, and Jehovah's Witnesses or Born Again Christians because they believe in non-violence; I use their beliefs to discourage those seeking converts.to other Abrahamic religions.; Jews, Most Christians and Muslims who all have great violent evils to answer for.
If you have time you can have a good philosophical discussion with such individuals; if not the they're just pests when you can do need to do something more important like post here.