She was a member of the
Indian Congress Party between 1937 and 1945. She was elected three times (1937, 1942 and 1951) as Member of the
State Legislative Assembly of
Bengal, later renamed West Bengal. She was offered the post of Deputy Minister in the Cabinet of 1952 of the then
Chief Minister, Dr.
Bidhan Chandra Roy, which she declined. Mira's reputation grew with her increasing involvement in the revolutionary movement. She was associated with Indian revolutionary groups, such as
Anushilan,
Jugantar and
Bengal Volunteers. As a member of
Bengal Volunteers she was the editor of the women's section of its magazine –
Benu. While, initially she was put in charge of the organisation's South Calcutta Women's group, she later moved into a low profile role, choosing to work for India's independence secretly. In those days she used to donate her entire salary towards India's freedom movement to her party
Bengal Volunteers. Around this time she also provided a channel for information between the revolutionaries who had to remain under cover and other members of the party. She participated in one of the important meetings of Bengal Volunteers held at
Baranagar near Kolkata to discuss the group's activities in Midnapore and other parts of the state. From 1933, the police grew suspicious of her activities and she was placed under constant surveillance. In 1938, many party members such as Bhavani Bhattacharya and Ujjala Mazumdar were arrested in connection with the shooting of Governor John Anderson in
Darjeeling district. Mira was cross-examined by the police for many hours in connection with this case. At this stage her father sent her away from Calcutta for two years to ensure her personal safety. She was very actively involved in fund raising activities during the Quit India Movement of 1942. In 1946, she was jailed for her nationalist activities. After her released from prison she became one of the first members of Netaji
Subhas Chandra Bose's
Forward Bloc. She had a devoted following in the
Ballygunge Constituency, all along the southeastern environs of the city, and was known for her social commitment. During the devastating
Bengal Famine of 1943, she, along with co-Congress workers played a leading role in organising
relief for famine victims. Later, after independence, her many activities included relief activities for those affected by famines, floods, and also the rehabilitation of the homeless and economically weaker women. ==Post-retirement==