Currently, it is the governing party in the Kerala Legislative Assembly and has significant representation of the state in Rajya Sabha.

[4] In 1946, Punnapra-Vayalar uprising was a mass communist movement against C. P. Ramaswami Iyer, the Diwan (Head) of Travancore in Alappuzha.

In 1964, in conjunction with the widening rift between China and the Soviet Union, a large leftist faction of the CPI leadership, based predominantly in Kerala and West Bengal, split from the party to form the Communist Party of India (Marxist), or CPI (M).

Namboodiripad, A. K. Gopalan and K. R. Gouri Amma stood with the Communist Party of India (Marxist).

However no single party could form a ministry commanding majority and hence this election is considered abortive.

[9] After 2 years of the government, due to continuous problems between CPI and CPI(M) many ministers from the smaller parties resigned eventually, and many parties subsequently left the front owing to the loss of majority the Second Namboodiripad ministry was dissolved in 1969.

[11] After his release, Pinarayi Vijayan reached the Kerala Legislative Assembly and made an impassionate speech against senior Congress leader K. Karunakaran holding up the blood-stained shirt he wore when in police custody, causing serious embarrassment to the then C. Achutha Menon government.

[14][15] In the late 1970s and early 1980s, two main pre-poll political alliances were formed: the Left Democratic Front (LDF), led by the Communist Party of India (Marxist) and Communist Party of India and the United Democratic Front (UDF), led by the Indian National Congress.