No normal gang, even Mafia, should ever be able to stand up to PC's, even Dark Champions (though Dark Champions are supposed to somewhat fear common weapons). It sounds like you have a real nice story going, but unless the NPG finds a way to stand up to the PC's, they'll never be much of a threat. Some things you could do:
1) Hey, we need special ammunition for our machine pistols!
2) Traps, as Monolith has suggested, but you don't need to give them special weapons, just tactics. It's hard to dodge a falling wall that's just blown down or fake room with napalm furniture.
3) Do what other groups do: Hire someone who can take them on. In the old Dark Champions supplements, that was what many groups did, otherwise they'd be cannon fodder. Or, since they've got cybermind, have them extort someone, or just "finger" them to a know hunted.
4) Have them approach a bad guy for help, only the have the bad guy turn on them (DEMON turns them into Demons, or the Steel Commado thinks he's taken care of the heroes so then he wipes out the gang so he can have the spoils for himself).
Just my 2 cents. Hope it helps!