Explanation:

First three were formed by Dr Ambedkar.

1.Samata Sainik Dal abbreviated as SSD is a social organisation founded by B. R. Ambedkar on 24 September 1924 with the objective of safeguarding the rights of all oppressed sections of Indian society.
2.The Republican Party of India (RPI) is a political party in India. It has its roots in the Scheduled Castes Federation led by Dr. B. R. Ambedkar. The 'Training School for Entrance to Politics' was established by Dr. Ambedkar in 1956 which was to serve as an entry point to the Republican Party of India (RPI).
3.Independent Labour Party (ILP) was an Indian political organisation formed under the leadership of Dr. B. R. Ambedkar in 15 August 1936 against the brahmanical and capitalist structures in the society.
4.There is no political party named Dalit Mukti morcha.