If there was ever a good non-Al-Qaeda target for a Predator drone or two its these guys. In the old days the CIA would have put these guys away a long time ago.
The problem is that you'd have to get them all at the same time. Wikileaks published a huge encrypted file last year which they say is their "insurance policy." The implication is that the dirt in it is so bad that no government could dare try to take them out lest they make public the decryption key.