TheGreatCornholio
First time out of the vault
Fancy Raiders is still Raiders.
I mean, that Bethesda is too lazy to flesh out the tribal identities of their human cannon fodder is sort of irrelevant. Raiders are simply any group of wastelanders that engage in pillaging as a means to support themselves. The Jackals, Vipers, Khans (all Khans), Bishop's Mercenaries, those Yakuza folks in Fallout 2, the Fiends, those greasers in the New Vegas Sewers, Maude's Muggers, the White Legs, and the Dead Horses are all raiders. Bethesda is for the most part not interested in them beyond "something to shoot that shoots back" though.
The raiders in 3 and 4 are always hostile also. In New Vegas you could walk right in to the fiends base camp. You could pass a speech check and not be attacked