Career
Das was elected general secretary of the Bengal Provincial Students Federation in 1970. Later Das became involved in trade union activism. In 1986 he was elected as one of the secretaries of the West Bengal State Committee of the Centre of Indian Trade Unions (CITU).
He was also included in the national working committee of CITU, posts he would hold until his death.
Das was known as a leader of the hardline tendency in CITU. Mrinal Das died from a heart attack at the age of 66.
