Karalasingham was born in July 1921.[1] His father Vaithianathan was a civil servant who worked in several parts of the country.[2] As a result, Karalasingham was educated at schools in Kalutara, Pannipitiya and Colombo, including Ananda College.[1][2] It was at Ananda that he was given the nickname Karlo by principal L. H. Mettananda.[1] Karalasingham had three brothers including V. Balasingham and V. Thanabalasingham.[2][3]
Karalasingham had a daughter (Nina) and a son (Chakravarthy).[1]
Karalasingham was sent to Bombay, India in 1941 and became the "mascot of the Indo-Ceylon revolutionary leadership".[1][2] In India the LSSP leaders merged their party with the Bolshevik Leninist Party of the United Provinces and Bihar and the Bolshevik Mazdoor Party of India to create the Bolshevik–Leninist Party of India, Ceylon and Burma (BLPI) in April 1942 with the LSSP as its Ceylonese branch.[5][6] Karalasingham was one of the founding members of the BLPI.[2] De Silva, Gunawardena and Perera were arrested by the Indian police in 1943 after being betrayed by Stalinist called Shukla and deported back to Ceylon.[6] Other LSSP members (Hector Abhayavardhana, Doric de Souza, Leslie Goonewardene, Vivienne Goonewardene, Karalasingham, Allan Mendis and Bernard Soysa) stayed behind in India to build up the BLPI.[6] Karalasingham was editor of the Calcutta based Permanent Revolution between 1943 and 1945.[1][2] He and de Souza were arrested in Bombay in March 1945, deported to Ceylon and imprisoned in Badulla.[1][2]
Karalasingham was secretary BLPI's Ceylon branch (1945), served on the editorial board of New Spark (1947–48), member of the BLPI central committee (1947–48) and was a delegate at BLPI conferences (1944, 1947, 1948).[2] He was a delegate at the Third World Congress of the Fourth International in 1951.[2] He studied law in Britain between 1952 and 1958 and on returning to Ceylon became an advocate of the Supreme Court.[2] Karalasingham stood as the LSSP candidate in Kankesanthurai at the March 1960 parliamentary election but on was defeated by S. J. V. Chelvanayakam, leader of the Illankai Tamil Arasu Kachchi.[8]
Whilst Ceylon's main political parties, the United National Party (UNP) and Sri Lanka Freedom Party (SLFP) supported the Sinhala Only Act, the leftists, led by the LSSP, opposed the act.[6] In May 1960 LSSP leader Perera proposed that the party form a coalition government with SLFP.[4] Samarakkody led a group of LSSP members opposed the proposition.[4] De Silva, de Souza, Goonewardene and Soysa initially opposed Perera's proposition but eventually abandoned their beliefs and supported the move.[4] The LSSP joined the SLFP government in June 1964.[6][9] LSSP members who opposed the move (Meryl Fernando, Karalasingham, Samarakkody, Bala Tampoe etc.) left the LSSP and formed the Lanka Sama Samaja Party (Revolutionary) (LSSP(R)) with Samarakkody as its secretary.[4][6][9] In December 1964 the LSSP(R)'s two MPs, Fernando and Samarakkody, together with several rebel SLFP MPs, voted for an opposition amendment to the government's throne speech, defeating the government and precipitating the dissolution of Parliament.[6][9]
Karalasingham stood as the LSSP(R) candidate in Kankesanthurai at the 1965 parliamentary election but was again defeated by Chelvanayakam.[10] Fernando and Samarakkody's action in December 1964 proved controversial within the LSSP(R) as they had in effect supported the capitalist UNP which would go on to win the 1965 parliamentary election.[4] The LSSP(R) supported Fernando and Samarakkody's action but some members who opposed it (Karalasingham and the Sakthi group) left the LSSP(R) and rejoined the LSSP in 1966.[2][4][11]
