|Leader||Sharad Govindrao Pawar|
|Founder||Sharad Govindrao Pawar|
Priya Ranjan Dasmunsi
Sarat Chandra Sinha
|Split from||Indian National Congress|
|Youth wing||Indian Youth Congress (Socialist)|
It broke away from the parent party in 1978 following Indira Gandhi's drubbing in the 1977 General Elections. Urs took with him many legislators from Karnataka, Kerala, Maharashtra and Goa including future Union Ministers and Chief Ministers A.K. Antony, Sharad Pawar, Dev Kant Baruah, Priyaranjan Das Munshi, Sarat Chandra Sinha and K. P. UnnikrishnanMohammad Yunus Saleem
He became the youngest chief minister of Maharashtra by toppling the Vasantdada Patil-led Congress government in 1978. He led a group of 40 MLAs to split from the parent party and formed the government with Janata Party's support.
Again in 1985, Pawar's party the Indian National Congress (Socialist) won only 54 seats and he became the Leader of Opposition in Maharashtra. With the split and the decline of the Janata Party nationally, Pawar soon realised that he can't get back to power in Maharashtra on his own. Pawar merged his party back into the Congress in 1986.
One section led by Sarat Chandra Sinha broke away from IC(S) in 1984 and formed a separate party known as Indian Congress (Socialist) - Sarat Chandra Sinha. This faction merged with Sharad Pawar's Nationalist Congress Party in 1999.
However, in Kerala, the residual faction of Indian Congress (Socialist), Congress (Secular) led by Kadannappalli Ramachandran still exists and is a part of the Left Democratic Front. In 2007, Democratic Indira Congress(Left) led by M. A. John merged with this party.
- Andersen, Walter K.. India in 1981: Stronger Political Authority and Social Tension, published in Asian Survey, Vol. 22, No. 2, A Survey of Asia in 1981: Part II (February, 1982), pp. 119-135
- "Why Sharad Pawar is a politician obsessed with staying in power". www.dailyo.in. Retrieved 23 July 2018.
- "Spotlight: Merger with NCP". Tribune India. 11 June 1999. Retrieved 19 May 2009.