Who was Veteran leader of Communist Party of India (CPI) and former Parliamentarian who died in Kolkata after a long illness?

Veteran leader of Communist Party of India (CPI) and former Parliamentarian Gurudas Das Gupta died in Kolkata after a long illness. He was 83.In 2001, he was elected as General Secretary of All India Trade Union Congress. He was also known as a trade unionist.