FUD
Fear, uncertainty, and doubt.
There's been plenty of FUD in the news the last 2 months regarding cryptocurrency in general, and Bitcoin in particular.
FUDster
Purveyor of FUD. It's analogus to the genuine word gangster and the want-to-be word bankster.
The FUDsters were at it again on CNBC and Bloomberg TV.
That's new to me as a terminology. Good one, thanks for sharing.