The North Liberation Army was a Rajput militia formed by Butan Singh in opposition to the growing influence of Pappu Yadav in Purnia.
Under Shankar Singh, the militia became politically influential by threatening and influencing voters as well as through booth capturing in the region.
The militia also groomed and supported Uday Pappu Singh who was inducted into the Bharatiya Janata Party[6] and became the member of parliament from the Purnia constituency for two terms from 2004 to 2014.
[7][8] Shankar Singh was granted membership of the Lok Janshakti Party and stood as its candidate from the Rupauli constituency where he was elected in February 2005.
Things changed when he defeated the NDA candidate Kaladhar Mandal of JDU by more than 8000 and in the election the 5 time MLA Bima Bharti stood third.