Mahuta and Turgan are both Ork who share the Underground.
Turgan is HB's first contact in the city, but their first contact actually dates back to a protection job he did as a freelance between assignments while in the UCAS. Turgan had contacts within HB's mercenary group who let it known that if people were interested in getting some extra cred, he'd have a small job for them. It was indeed a small job, protecting a smuggler during a tense meeting with buyers that had lately shown they might be more interested in the goods than in paying for them, and showing up with extra muscle seemed a good idea. HB earned his stripes in Turgan's eyes when he disarmed two of the hired thugs even as they were still drawing weapons, and promptly tossed the buyer into his fellow mercenaries' hands to discourage any further "funny business". Not a shot was fired, and the buyer was suddenly a lot more cooperative.
When HB finally thought about leaving to settle elsewhere without the hassle of being part of an Ares-sponsored mercs, he dug up Turgan's number and arranged for a way in the Seattle, again tagging along a smuggler. Once in the city, Turgan put HB in touch with Mahuta, a gang leader "offering" shelter for "fellow orks down on their luck".
Mahuta turned out to be little more than a thug with a brain, running protection rackets in his part of the Underground. Still, the first time they tried to impress HB, it turned out he impressed him. Having had little info from Turgan, they expected another poor immigrant slot hoping for a better life in the Emerald City, so they sent an unproven ork from their gang to rough him up. HB was nice enough to only break his arm and send him back with a note saying he didn't need movers to get his stuff into his new home. Somehow, Mahuta found it hilarious (more than the poor guy who'd pulled a knife on HB anyway) and met him in person. Mahuta had enough brains, contacts and resources to be helpful though, dealing with illegal immigrants all the time, and he "generously" offered HB to lend him the contacts and resources he need to settle in, mostly in acquiring a SIN and some licenses for the more obvious stuff he carried. Of course, the gang leader sent him the bill, and now not only does he collect HB's rent, he also collects the interests on the 10.000 HB owes him.
After selling most of the stuff he would likely no longer need through Turgan, HB agreed to do some jobs, either for the fixer or the gang leader really, so long as it pays his rent and lets him eat, and maybe buy that new VR game coming up.