A mass political party had been organized among the Nepalese population in Benaras by October 1946 by the name of All India Nepali National Congress.
[4] Around the same time in Kolkata, another popular destination for the Nepalese diaspora, a separate organisation by the name of All India Nepali Gorkha Congress was formed whose chairman was Dharma Narayan Pradhan.
Koirala during this time traveled to Kolkata, Darjeeling, Assam, Bhagsu and Dehradun which had a significant population of Nepalese exiles.
[5] In January 1947, in a mass session organized by Nepalese pro-democracy activists in Kolkata, the two parties merged and under the name Nepali National Congress.
The organization's modus operandi was chosen, and attached itself to the civil conscience process in Nepal by establishing Tanka Prasad Acharya as its chairman.
On 16 May 1947, after weeks of protests prime minister Padma Shumsher announced sweeping administrative reforms and released political prisoners.
The unexpected release of Koirala caused a rift in the party with Regmi insisting that he should serve his term as acting president.
[4][6][9] The 1948 Constitution was announched by Rana prime minister Padma Shamsher on 26 January with significant reforms to the administration of the country and was welcomed by the party as a step in the right direction.
The new constitution was supposed to come into effect from the Nepali New Year in April and to be fully operative within twelve months, but was not implemented by the new prime minister.
The front organised satyagrahas against the government's handling of the Security Act and also demanded for the release of Kunwar Indrajit Singh and other political prisoners.
In July 1957, the party along with Nepali Congress and Nepal Praja Parishad offered to form a coalition government in order to forestall Kunwar Indrajit Singh's appointment as prime minister, which was ignored by King Mahendra.
King Mahendra finally announced the date of the election on 15 December and the front stopped their protests, the party also endorsed the royal proposal but expressed hope that the parliament would serve as a constituent assembly as well.
[4] In the municipal elections of the Kathmandu Valley in January 1958, the front failed to gain a majority of seats in most of the local councils losing to Independents backed by the Communist Party of Nepal.
King Mahendra called a meeting of five political parties in April 1958 to form a national unity government to hold the elections proposed for 1959 following which Dilli Raman Regmi joined the cabinet of Subarna Shamsher as Minister for Home Affairs.
[4] After King Mahendra's coup in 1960, political leaders including Dilli Raman Regmi were arrested along with many party workers.