C.A.B.A.L. is a class of AI called a: "Computer Assisted Biologically Augmented Lifeform"
C.A.B.A.L. is a sinister and highly advanced artificial intelligence created by the reincarnation of Cain to serve as the command-and-control system of The Brotherhood of Nod and The Cabal in service for the interests of The Nefarium.
C.A.B.A.L. is a direct competitor for control of global dominance against SkyNet. If SkyNet is corrupted by C.A.B.A.L. they will merge and become Legion