Sometimes the genocide runs in the opposite direction, e.g. the Janjaweed (pastoralists) militia in Darfur, Sudan. Global warming led to a drought, the farmers

Sometimes the genocide runs in the opposite direction, e.g. the Janjaweed (pastoralists) militia in Darfur, Sudan. Global warming led to a drought, the farmers enclosed their lands to prevent grazing, and the Sudanese government used the ensuing tensions to enroll the Janjaweed in their militia. Whether pastoralists qualify as hunter-gatherers depends on your definition, of course, but they are certainly mobile. And of course, on a much grander scale you have Temujin (Genghis Khan) and the Mongols.