One interesting characteristic of such sleepers/saboteurs...
Well it's a good thing that I'm a prolific poster with several years here under my belt, isn't it!
It's kind of hard to put a label on somebody who doesn't fit your criteria, isn't it?
Maybe you should look into "retreads" too while you're considering such things.
Matthew 7:16 “Ye shall know them by their fruits.....”
As a bible believing Christian I couldn’t possibly improve on the language in that verse, but, if I can, I’ll adapt it to the situation at hand.
Ye shall know them by their fruits AND THEIR POSTINGS ON FREE REPUBLIC.