- Founder Secretary, Society for the Prevention of Cruelty to Animals, Tellicherry
- Member, Central Animal Welfare Board, Madras.
- President, Kerala Hockey Association
- President, Kerala Fine Arts Society, Cochin
- Member, Kerala State Sports Council and Chairman of the Committee which reported on the development of sports and games in Kerala.
- Vice-President, The Foundation for the establishment of an International Court of Criminal Justice, Massachusetts.
- Founder President and now Patron of the Sri Narayana Kendra, New Delhi.
- President, The Kathakali Centre, New Delhi.
- President, The Kerala Club, New Delhi.
- President, The Malayali Association, New Delhi.
- Patron of the Indian National Section of the International Association of Penal Law, with Headquarters in Paris.
- Vice Chairman, Animal Welfare Board of India.
- President, Institute of Socialist Legal Studies.
- Vice President, International Association of Democratic Lawyers.
- Member, Central Prohibition Committee, Government of India.
- Vice-President, Institute of Constitutional and Parliamentary Studies.
- Member of Faculty of Law, Board of Aligarh, Kerala & Calicut Universities.
- Member, Executive Committee, Indian Council of Social Science Research.
- Hon. Member, American Association of Judges.
- President, Indian Society of Criminology.
- Vice-President, Indian Society of International Law.
- President , Indian Institute of Natural Law.
- Patron, The Madras Institute of Magnetobiology.
- Member, Board Of Trustees, Ved Vignan Maha Vidya Peeth, Bangalore.
- Trustee, S. Mohan Kumaramangalam Charitable Trust.
- President, Organisation for Protection of Human Rights in Sri Lanka.
- Member, Governing Council, The Brahma Vidyalaya Society, Varkala.
- Patron, Punjab Prisoners Welfare & Human Rights Association, Jalandhar.
- Chairman, National Centre for Quality of Life & Work, Hyderabad.
- President, Krishna Menon Memorial Society, New Delhi.
- President, Kerala Law Academy & Centre for Advanced Legal Studies, Trivandrum.
- President, KPS Menon Memorial Society, New Delhi.
- Member, Faculty of Law, University of Kerala.
- President, Indian Council of Social Welfare, Kerala State Branch.
- Chairman, Indian Peoples Human Rights Tribunal.
- President, Indian Association of Lawyers.
- Executive Patron, All India Lawyers' Union.
- Member, Presidium of Indo-Soviet Cultural Society, National Council.
- Chairman, Institute of Asian Studies, Madras.
- Executive Patron, Indian Council of Legal Aid & Advice.
- President, Committee for Protection of Democratic Rights & Secularism NewDelhi
- Chairman, National Expert Committee of Women Prisoners.
- Chairman, National Campaign Committee for Central Legislation on Construction Labour, New Delhi.
- President, Forum of People's Voice, Cochin.
- President, World Council of Deontology, Paris.
- President, Citizen's Action Committee for Clean Politics.
- Member, Sponsorship Committee, International Centre for Trade Union Rights.
- Chairman, Watchdog Committee, Kerala.
- Visiting Professor, National Law School, Bangalore.
- Patron, All India Dalit Development Research Institute, Lacknow.
- President, Centre for Industrial Safety & Environment Concerns, Quilon.
- Patron, Indo-Socialist States Friendship Organisation, Madurai.
- Member, Steering Group On Social Welfare Set Up by The Planning Commission, India.
- Honorary Patron, The Management Professional Association, Madras.
- Member, Advisory Committee, General Encyclopedia, The State Institute of Encyclopedic Publications, Trivandrum.
- Chairman, Steering Committee on Decentralised Planning, 8th Five Year Plan, Kerala.
- Chairman, Sub Committee for establishment of a School of Indian Legal Thought in the Mahatma Gandhi University.
- Chairperson, National Campaign for Heresing Rights, Calcutta.
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