Nirmohi Akhara is a Hindu religious denomination following its own religious faith and customs . It is one of the 14 akharas recognized by the Akhil Bharatiya Akhara Parishad and belonging to the Vaishnava sampradaya . It is headed by Mahant Bhaskar Das.
The group has been in light in connection with the Ayodhya debate since 1959 when it filed a suit to take over the disputed site of Babri Mosque. 
Nirmohi Akhara filed a suit in January 1885 with the sub-judge of Faizabad, seeking consent to construct a temple for the Indian God Rama in the area called the Ram Chabutra, adjacent to the Babri Mosque. The sub-judge held then that two large religious structures in close proximity could potentially be a threat to public order. Permission was denied by the court, though the Nirmohi Akhara has since kept up its effort to reclaim the land and construct the temple.
In 1989, the Nirmohi Akhara filed a lawsuit against the Uttar Pradesh State government claiming that they had been worshipping the deities installed at a temple at the then disputed site since time immemorial. Accordingly, they requested the Court to handover management of the temple to the Nirmohi Akhara. 
On September 30, 2010, a Lucknow panel of three judges of the Allahabad High Court pronounced the verdict on the case deciding to give a third part of the land to each party namely the Sunni Waqf Board and the Hindu Mahasabha, with Nirmohi Akhara getting the areas named Sita Rasoi and Ram Chabutara, within the disputed siteSource: Wikipedia.org