He was 92. Menon had been ailing for some time and passed away last night, his family said.
He had anchored independent trade union in the state, and is survived by his wife and two daughters.
Menon was instrumental in building up the trade union movement irrespective of political affiliation and had led nearly 50 unions simultaneously for over five decades.
Menon began his career as a chemist in Fertilisers and Chemical Travancore (FACT) in 1946. An agitation in the company in 1949 changed the course of his life and he became a trade union leader.