The Justice Party, earlier South Indian Liberal Federation, was a political party in the Madras Presidency of British India. It was established in 1916 by Natesa Mudaliar and co-founded by T. M. Nair and P. Theagaraya Chetty as a result of a series of non-Brahmin conferences and meetings in the presidency.  

• Bahishkrit Hitakarini Sabha is a central institution formed by Dr. Babasaheb Ambedkar for removing difficulties of the untouchables and placing their grievances before government. 
• S.N.D.P. means Sri Narayana Guru Dharma Paripalana Yogam or sangam. Narayana Guru through his socio religious teachings and writings has become so famous in the socio-religions and political scenario of Kerala during 19th century that all the young people turned towards the reformative movements of Sri Narayana Guru and voluntarially they have redesignated their former youth association (it’s called Vivatu sangha) as S.N.D.P. It was registered as a joint stock company in January 1903 with Sri Narayana Guru as life time president. 

Source: NCERT