ALG would probably be more likely to partake in a joint venture alongside the IMG than the Junkers.
ALG are not "allied" to Junkers per se, Junkers are simply used to do the really dirty work that ALG doesn't want to handle (Junkers don't get health and safety officers poking their noses in:P).
Gallia is probably more of a secret for Junkers than the fact that they smuggle or pirate...and I'm guessing ALG doesn't know that...