SLFSP was formed in 1964 by C. P. de Silva when he broke away from the Sri Lanka Freedom Party.
In the 1965 elections, SLFSP contested in coalition with the United National Party.
[3] SLFSP joined the coalition government led by UNP.
[4] SLFSP amalgamated the Lanka Prajathanthravadi Pakshaya.
This article about a Sri Lankan political party is a stub.