Yeah they've got spies in there
Though there are more dangerous positions to be a spy in than others
Heck, there are even worse positions in general than being a spy. Being a rebellion mech pilot in any of the walled cities is a NIGHTMARE.
(Walled cities are the largest corporation bases, which house the human civilian population of Onyra. Being a mech pilot there is hard because not only are you surrounded by corporate eyes at all times, but you also have to avoid hurting civilians of you end up in combat)