Yadavs to renounce their belief that they were natural leaders and that the Kurmi were somehow inferior. Similar problems beset a later planned caste union, the Raghav Samaj, with the Koeris. Again in the 1970s, the India Kurmi Kshatriya Sabha attempted to bring the Koeris under their wing, but disunity troubled this alliance. Many private caste-based armies surfaced in Bihar between the 1970s and 1990s, largely influenced by landlord farmers reacting to the growing influence of left extremist groups. Among these was the Bhumi Sena, the membership of which was drawn mainly from youths who had a Kurmi origin. Bhumi Sena was much feared in the Patna region and also had influence in the districts of Nalanda, Jehanabad and Gaya. See also Kunbi Koeri Patidar Patel Kochaisa History of Backward Caste movement in Bihar References Notes Citations Further reading Social groups of Bihar Social groups of Uttar Pradesh Social groups of Madhya Pradesh Agricultural castes Social groups of Odisha