Yes, if someone is not DF or DA, but the elders deem them as dangerous, or feel the "flock should be safeguarded" from them, they will systematically and thoroughly ensure that an intense and deliberate character assassination takes place.
They will talk to every congregation member saying things like "its best that you have nothing to do with so and so. We can't say why, but trust us, as we know of things...."
That is called slander in most people's books. In JW land, that is called "elders protecting the flock"