The Vanquished is a gang of consisting entirely of outcast and clanless Dremora. They reside within the central district of the Shambles in Fargrave, but that isn't the only place they can be found; they wander the planes of Oblivion. They actively hunt mortals in their territory, and are known for not keeping to their word.
The Ghost People Tribe or "Veeskhleel" in Jel are an Argonian tribe which have a very dark reputation. Named for the pale sickly scales they share, they rarely venture from their homes in the Deepmire, leaving only under the cover of night to steal Argonian eggs and corpses. With the latter, the Veeskhleel offer the souls from the bodies they take to their Hist.
The Veiled Heritance is a covert group of Altmeri nationalists seeking to depose Queen Ayrenn and appoint their own regent, the Veiled Queen, High Kinlady Estre — Ayrenn's sister-in-law and her brother Naemon's wife. One of their main bases is known as The Veiled Keep, and is located under their training grounds on Errinorne Isle in central Auridon.
The Vinedusk Rangers are a group of for-hire assassins in Valenwood. They have a reputation as skilled assassins. They were originally just a Bosmer tribe, but after many years of constantly fighting the Khajiit Dakarn clan across the border, they overstepped and raided Arenthia. Along with the Dakarn clans attempt at organized crime in Dune, the citizens of both cities finally resolved to deal with these marauding bandits. They formed militias and hired mercenaries to clear out the hills where the bandits lurked. Ironically both groups survived in part but turned from banditry to legal jobs. The Vinedusks became the Rangers, while the Dakarn became the Duneguard Outwalkers.