I think (from the Dharma perspective) they are all "hostiles". Mikhails link to Ben and Tom is Bea. I think the only true Dharma Initiative person we've seen so far has been Kelvin. Ben's camp may include people who had ties to the Dharma Initiative, but at some point a faction of the D.I. decided to go in a different direction. There was a conflict and the "hostiles" won.