Alagesan was a member of the Constituent Assembly and Provisional Parliament from 1946 to 1951. In 1952, he was elected
Member of Parliament from
Chingleput. He lost the elections in 1957 but was re-elected in 1962. He supported the anti Hindi agitation and opposed the Central Government's language policy. On 11 February 1965, he and
C.Subramaniam two union ministers from Madras state, resigned protesting the Union government's language policy. After Shastri's assurances to Tamils that English would continue to be used for centre-state and intrastate communications and that the All India Civil Services examination would continue to be conducted in English, he and
C.Subramaniam withdrew their resignations. He also served as a
Member of Parliament from
Tiruthani from 1971 to 1977 and
Arakkonam from 1977 to 1980. As an active parliamentarian, he left an indelible imprint on the proceedings of the House. He had also served effectively on various Committees of the House. A versatile personality. He was a reputed social reformer and a distinguished administrator. He relentlessly worked for the removal of social evils like untouchability and prohibition. Alagesan served as India's Ambassador to
Ethiopia from 1968 to 1971. ==Indian Independence Movement==