The Bharatiya Jana Sangh (abbreviated as BJS or JS, short name: Jan Sangh; lit. 'All-India People's Union') was a Hindutva political party active in India. It was established on 21 October 1951 in Delhi by Shyama Prasad Mukherjee. Jan Sangh was the political arm of Rashtriya Swayamsevak Sangh (RSS), a right-wing Hindutva paramilitary organisation. In 1977, it merged with several other left, centre, and right parties opposed to the Indian National Congress and formed the Janata Party. In 1980, the members of the erstwhile Jan Sangh quit Janata Party after its defeat in the 1980 general election and formed the Bharatiya Janata Party, which is the direct political successor to the Jan Sangh. In Bihar, Ramdeo Mahto considered as founding leader of Bharatiya Janata Party – Bihar, because he brought BJP Into the power in Bihar, he elected as a candidate of Bhartiya Jana Sangh to Bihar Legislative Assembly in 1969 Assembly elections from Patna East Assembly constituency.