M. S. Krishnan, or MSK, was an Indian trade unionist and leader of Communist Party of India.
[1] MSK became involved in student movement, and would leave his studies unfinished to become a full-time labour organizer in Bangalore.
[4] As of the mid-1980s he served as the Secretary of the CPI Karnataka State Council.
[5][6] He served as President of the All India Trade Union Congress 1990–1995.
[1][7] MSK was active in organizing public sector unions in Bangalore, and took active part in the Joint Action Front as a measure to mobilize public sector workers.