A bandit tribe mostly contrived of the more native tribal races of the region, Goblins, hobgoblins, bugbears, etc.
The Cragmaws live in the caves in the hills and mountains of the region or the delapedated structures and villages lost to time.
The Cragmaws leader, King Grul was recently paid by The Black Spider to collect personnel and their information about the Wave Echo Cave. King Grul and the Cragmaws were successful in procuring the Rockseeker Brothers and a map to Wave Echo.
The Cragmaws appear to have connections with the Redbrand Bandits in the village of Phandalin. Unsurprising as the Redbrands appear to be doing similar work for The Black Spider.