 After marriage, Radhakrishnan shifted his political base to Trivandrum from Varkala.He set up a brilliant practice for himself at the Trivandrum Bar in Criminal Law and was one of the most sought after lawyers of the time.He also continued his political activities along with his legal career and contested various elections as a candidate of the Communist Party of India (Marxist) with whom he was associated ever since the party was formed in 1964.