 Karalasingham stood as the LSSP candidate in Uduvil at the 1970 parliamentary election but on was defeated by sitting MP V. Dharmalingam.He served on the editorial board of "State" in the 1970s and was a director of the state-owned Air Ceylon between 1970 and 1975 when the LSSP was in a coalition government with the SLFP.Karalasingham died on 8 September 1983.