Who was the founder of the Congress Socialist Party?

 Ram Manohar Lohia

Ram Manohar Lohia (1910-1967) : Socialist leader and thinker; freedom fighter and among the founders of the Congress Socialist Party; after the split in the parent party, the leader of the Socialist Party and later the Samyukta Socialist Party; Member, Lok Sabha, 1963- 67; founder editor of Mankind and Jan, known for original contribution to a non-European socialist theory; as political leader, best known for sharp attacks on Nehru, strategy of non-Congressism, advocacy of reservation for backward castes and opposition to English.