The Hutu were an ethnic group in Africa, specifically Rwanda.
The Doctor speculated it might be the Hutu or the Tutsi tribes that were hunting and trying to kill Abasi in the 1860s. (AUDIO: The Ghosts of Gralstead).
In the wake of Miracle Day in 2011, Tutsi in Rwanda bashed the heads of Hutu villagers with clubs and ran over them with bulldozers. (TV: Rendition)