Madhesh elders have a significant role in the democratic movement of Nepal. When talking about democracy in Madhesh, the names of celebrities like Mahendra Narayan Nidhi, Saroj Prasad Koirala, Rudraprasad Giri, Rameshwar Prasad Singh, Ram Narayan Mishra, Bodh Prasad Upadhyay come up, who have sung unforgettable songs for the country.

However, very little has been written about his contribution. Journalist Kishore Nepal has written the book 'Nepalka Nidhi' after a long study and research about Mahendra Narayan Nidhi, so that these names are not limited to the pages of history and their contribution should be known to the future generations as well. Nidhi Nidhi, one of the heroes of the establishment of the Congress Party, is written in a book that is universally accepted among the warriors who laid the foundation of the democratic movement in the Mithila region. 

The question may arise in the minds of the new generation who are especially interested in Congress politics, so was Mahendra Narayan's ancestral legacy politics? His father, Rajeshwar Nidhi, a distinguished social worker of Nagarain village, 14 km south-Indian border from Janakpurdham, was a zamindar of Nagarain, not in politics. When the rulers used to entrust the zamindars with administrative work like government levy, tax collection, fines. Therefore, the landlord had to have a good relationship with the ruler. Author Nepal has written, "Perhaps it is because of this that Rajeshwar Nidhi gave the official name of his son, Mahendra Narayan." King Tribhuvan's eldest son Mahendra was born two and a half years before Nidhi was born. 

While reaching Darbhanga once in the course of business, that young Mahendra Narayan Nidhi had the opportunity to listen to Gandhi's speech. After listening to the speech, Nidhi's personality was influenced by Gandhi. After that he also studied more about Gandhian ideology. A lifelong non-violent movement partisan, Nidhi is also known as a Gandhian leader of Nepal. Nidhi reached Patna in June 2003 on business. Nidhi's father Rajeshwar was in contact with BP Koirala's father Krishna Prasad in connection with business and zamindari. After coming in contact with BP, Nidhi and Dr. Intimacy between Ram Manohar Lohia intensified. Nidhi's life-path and goal became the starting point to change, BP and Dr. Meeting with Lohia. Thus Dr. Nidhi was attracted and oriented towards politics by Lohia's inspiration. 

In 2002, when he came to Kathmandu to ask permission to establish a school in his own village Nagarain, Mahendra Narayan had experienced humiliation from the rulers since he was severely beaten by the soldiers for not knowing the rules of walking while going to the camp at Putlisadak from Singha Darbar. Patna BP and Dr. After the meeting with Lohia, the fire of humiliation in his heart was suddenly ignited. Then BP and Dr. Accepting Lohia's request to join politics, he jumped into politics. 

Mahendra Narayan did not only establish the Congress in the soil of Mithila, but also conducted a village-to-village campaign to acquaint the local people with the reality of how Rana has ruined the economic, social and political conditions of the country. In that sequence, on January 1, 2007, Nidhi was appointed as the Prime Minister of the People's Government after the Mukti Bahini attacked and captured the Nepali army barracks, the main market, and the office of the chief. On February 7, 2007, King Tribhuvan appointed him as a member of the Advisory Council. Mahottari District Congress was formed under his leadership in 2008. BP accepted his request to hold the party's ninth convention on 10-11 June 2009 in Janakpur. When the differences between Matrika and BP increased. Nidhi, who is in Matrika's camp, thought of supporting BP in the convention. Accordingly, he presented BP's decision to expel Matrika from the party as a formal proposal in the closed session. After that Matrika was expelled from Congress. 

Congress won 74 out of 109 seats in the first parliamentary elections of 2015. Congress won 24 out of 35 Madhesh seats. Nidhi was elected from Constituency No. 43 Janakpur. Impressed by Nidhi's mature organizational skills in Madhesh, BP nominated him. After the election, he became the Deputy Speaker of the House of Representatives. When the Speaker of Parliament was Krishna Prasad Bhattarai. 

In the year 2017, Nidhi went to meet King Mahendra, who had come to Janakpur to hold a fair on his fifth birthday. With the intention of pulling Nidhi to his side, Mahendra said, 'Both of us have the same name and the same job. Both of us are engaged in serving the people through politics. So let us work together for the country. Since we have the same name, let's get married. Nidhi ignored Mahendra's proposal and dismissed it. Kishore Nepal has written, 'Mahendra felt that he was hungry for power like other leaders. But, Nidhi proved it wrong.' 

Nidhi's political personality was enhanced due to his closeness to BP. Seeing that personality, Mahendra continued to try to pull Nidhi into the Panchayat till his life. Raja Mahendra, who started the Panchayat system by dissolving both the Parliament and the Government on 1st December, 2017, one day tried to cheat the Nidhi again. Risalla, a horseman from the palace, handed over a letter from King Mahendra to Nidhi, who was staying at Putlisadak. In the letter, the King invited Nidhi to 'participate in the Council of Ministers by supporting his move'. In response, Nidhi wrote back, 'That is not possible, Parliament should be restored immediately, parliamentary system should not be disturbed.' On 22nd of December, after banning the parties, Nidhi left for his hometown Janakpur. However, before reaching home, the police arrested Nidhi from Janakpur airport on the order of King Mahendra. He spent 10 years in prison. Father Rajeshwar passed away while he was in jail. 

BP and his associates remained under house arrest in Sundarijal Jail after that move by Raja. After being released from detention, BP said that there is no alternative to violent movement for the restoration of democracy in Nepal. However, Speaker of the Dissolved Parliament Bhattarai and Deputy Speaker Nidhi disagreed. Meanwhile, BP, who had gone to Europe for a health check-up, after returning home, started a fund-raising campaign to collect weapons. The plane hijacking on 28th June 2030 was for that purpose. Nidhi did not agree to that scandal. Many pro-democracy youths were killed in attacks at various places. Thus BP was disappointed after the campaign of armed struggle failed. Bhattarai and Nidhi accepted the offer of abandoning the armed struggle with BP and starting a non-violent movement from within the country. To make the 2046 movement peaceful and non-violent, Acting Chairman Bhattarai and General Minister Nidhi had prepared a strategy.