During his days in England, Rajan was a close associate of
V. D. Savarkar and
V. V. S. Aiyar and was a member of the
India House. However, in May 1910, Rajan had a quarrel with Aiyar. On his return to India in 1914, he met
Rajagopalachari and joined the
Indian National Congress. He participated in the agitations against the
Rowlatt Act and was jailed for a year. Rajan served in a number of party posts in the Indian National Congress over the years. He served as the General Secretary of the Congress and as the President, and later, Secretary of the
Tamil Nadu Congress Committee. In 1934, Rajan was elected to the Imperial Legislative Council of India and served till 1936, when he resigned owing to differences of opinion. Rajan participated in the 1937 Madras provincial elections and was elected to the Madras Legislative Council. He took the portfolios of public health and religious endowments in the Rajaji cabinet. == Later years and death ==