Dr. Moon is seen with Phobia in the first issue. Merlyn talks about how people seen with them keep vanishing and how Signalman's been missing for months.
Dr. Moon's M.O. is messing with people's heads/personalities. (Somebody mentioned that story where he and the Joker turned Catwoman evil again, good story) (This is not that different from what we saw the JLA doing to Dr. Light,btw.) With Phobia's ability to control people's emotions, it would no doubt be much easier for him (them?) to alter personalities.
Are they brainwashing people to go out and do these killings? Signalman? Martin Stein? Bat-Mite? Franta?