Faction with coalition of tradefolk/tradefolk underground

[apocalypsesmeep]

I made the mistake of killing slate awhile back, (I'm a troll), and now the tunnel folks in FP are threatening to me. From what I can tell it is the coalition of underground tradefolk faction hit. I'd also like to raise my coalition of tradefolk faction to allow me to buy alchemy supplies in nro.

Does anyone have some really good ways to do this? Killing the banker in RV seems to raisw underground faction, but that just seems like a dick thing to do.