On September 15, 1974, Mohan Bikram Singh and Nirmal Lama organized a "Fourth Convention of the Communist Party of Nepal" at the Srikrishna Dharamshala, Varanasi, India.
[2] Prior to this conference, both Lama and Singh had belonged to the 'Central Nucleus' group, gathering leftwing elements from the Amatya-led Communist Party of Nepal.
The Central Nucleus, which initially had also included Manmohan Adhikari and Shambhuram Shrestha, had tried to reorganize the party and reunite with the Pushpa Lal group.
However, such a merger never took off, partly due to Pushpa Lal's hesitation to merge his own faction into another party (since he claimed to represent the legacy of the original Communist Party of Nepal) and partly due to Pushpa Lal's wish to collaborate with the Nepali Congress against the royal regime (which MBS did not accept).
In 1980 a Central Committee member, Rishi Devkota (alias 'Azad') resigned from the party, accusing it of reformism and being soft on Soviet social imperialism.
In November 1983 the followers of MBS held a separate conference, and formed Communist Party of Nepal (Masal).
Gajurel, Mohan Baidhya, Khampa Singh, Bachaspati Devkota, Bhairav Regmi, R. Shrestha[4] as well as future Maoist leaders like Pushpa Kamal Dahal and Baburam Bhattarai.