He had close ties with the Delhi unit of the Rashtriya Swayamsevak Sangh (RSS), including its pracharak Vasantrao Oak.
[6] Towards the end of 1950, Shyama Prasad Mookerjee gathered in Delhi a core group of activists including M. C. Sharma for forming a new political party, the future Bharatiya Jana Sangh.
[9] However, according to N. C. Chatterjee, the President of the Hindu Mahasabha, V. D. Savarkar blocked the merger proposals because he disliked Golwalkar and expected that the combined organisation would be dominated by the RSS.
However, at the party's second plenary session in Bombay in 1953, Sharma was told upon his arrival that the RSS headquarters at Nagpur had decided in favour of another person and he was asked to stand down.
Despite his resistance, the eventual composition of the Working Committee was heavily weighted in favour of the RSS faction, including such RSS leaders as Bhai Mahavir, Jagannathrao Joshi, Nana Deshkukh, Atal Bihari Vajpayee, Balraj Madhok, Bhairon Singh Shekhawat and Sunder Singh Bhandari.
At the Indore session of the Central General Council in August, Sharma's Presidential address emphasised the principles laid down in the Party constitution, namely, "secular nationalism and unflinching faith in democracy."
A delegate from Punjab brought forward a resolution condemning the interference of the RSS in party affairs, and it was decided to refer it to a further session of the Council.
[12] However, Upadhyaya as the General Secretary refused to a call a second meeting of the Council and maintained that the decision belonged to the Working Committee, not the President.
He confided that Shyama Prasad Mookerjee was "seriously perturbed" by the demands of the RSS leaders in the appointment of office-bearers, nomination of candidates and matters of policy.
However, the Working Committee accepted his resignation on its own and appointed Bapu Saheb Sohni, the RSS sanghchalak from Berar, as the Acting President.
The Delhi unit officials formed a new party called the National Democratic Front, which lasted till 1957.
[18] A. G. Noorani noted that in the succeeding years, Jana Sangh and its successor, Bharatiya Janata Party, forced out two more elected Presidents, Balraj Madhok in 1973 and L. K. Advani in 2005, at the bidding of the RSS.
"[20] Journalist Kingshuk Nag remarked that it was the end of the legacy of Shyama Prasad Mookerjee in Jana Sangh, after which the RSS took full control.