The erstwhile RSP, which was part of the LDF for almost three decades, decided to walk out of the LDF in March 2014, after the CPI(M) arbitrarily announced the candidature of politburo member and sitting legislator M.A.Baby for the Kollam Lok Sabha seat. Later RSP was offered the loksabha seat by the UDF. The RSP candidate N.K. Premachandran defeated LDF candidate M.A.Baby in the election of 2014. Later in June 2014, both the factions of RSP in Kerala- RSP(B) and RSP-merged. Later, a faction headed by Kovoor Kunjumon left the party to form a new party named Revolutionary Socialist Party (Leninist). Main faction of RSP suffered a huge defeat in the 2016 Kerala Legislative Assembly election, with all its candidates losing. But, Kovoor Kunjumon was elected to the Legislative Assembly, and his party supports LDF.