Caste-related violence in Bihar
The Caste based violence in Bihar has a history of conflict between the Forward Castes, who controlled vast swathes of land, and the Lower Castes who were mostly poor. The Zamindari abolition and communist upsurge in Bihar gave rise to a tug of war between upper and the lower castes.
Source: Wikipedia — Caste-related violence in Bihar (CC BY-SA 4.0)