Good Resistance groups in the city are usually short lived, as the CCA quickly learn about it due to loyalists wanting a few points reporting em' all the moment the form. Aside from that, the Outlands has a very scattered form of Resistance per say. People generally form small groups and keep to themselves, trading with eachother and the like every now and then. The only time they really come together is when Overwatch comes in to do a sweep or raid of the pass. But, there are a few groups I believe still around that are friendly with the general populace, and I guess you could consider them Resistance groups kind of. You find out about this stuff ICly, though. Hope that clears some stuff up for you.