 In 1951, Madhok joined Shyama Prasad Mookerjee in the formation of what later become the political party of the Sangh Parivar, the Bharatiya Jana Sangh.The Bengal branch of the Jana Sangh was established by Mookerjee on 23 April 1951 and the Panjab and Delhi branch was established by Madhok a month later, on 27 May 1951.Madhok served as the secretary of the Panjab branch and later, a member of the Working Committee of the national organisation.