The Collins Tribe is a group in the Plains Nation.
In 2027 they were based in an area north of The Tower. When Sebastian Monroe occupied the area around The Tower, Major Franklin expresses concern that the Collins tribe, along with the Kaminski tribe to the south, will not be happy the Militia are occupying the area, and may attack. ("Clue")
If the Thompson Tribe is any indication, the Collins Tribe could be named for the ruling family as well.