Colonial era Sen was an activist for Indian independence, supporting the
Indian National Congress, and was committed to Gandhi's philosophy of grass-roots democracy and a self-reliant rural economy. Gandhi's influence on Sen was so pervasive that, in the 1920s, he shifted his area of social and political activity to
Arambagh, an under-developed and
malaria-infested area of West Bengal and worked ceaselessly for its betterment. For his efforts, Sen earned the sobriquet "Gandhi of Arambagh". He was thought to have been encouraged by the then president of the union and the noted academic (headmaster of
Arambagh High School)
Nagendranath Chatterjee, whom he defeated in a poll, but they never lost mutual admiration. It is reported that Sen offered a
pranam to Chatterjee every time they met, long after he became a national figure. Sen spent over ten years in various jails between 1930 and 1942 for anti-British activities. During that time period, the Congress Party office at
Serampore was his home and he earned virtually nothing, simply possessing one home-spun
dhoti (sarong) and
kurta. In the partial exercise of democracy permitted by the British in the 1940s, Sen was elected to the Bengal Assembly from Arambagh in 1944 and was deputy leader of the opposition.
After independence In 1948, he was inducted by Chief Minister
Bidhan Chandra Roy into the West Bengal Cabinet as Minister of Agriculture. This was a portfolio he held until 1967. He also functioned as Roy's Deputy Minister and was acknowledged as his political heir. After Roy's death in 1962, Sen became West Bengal's third Chief Minister. Three years later, his regime faced a drastic food shortage in the state following a countrywide drought. At a Food Ministers' conference in Delhi, Sen advocated introducing the politically unsound measure of food rationing in urban areas. Within months, he had introduced food-grain rationing in the state, a system which has continued with minor modifications to this date. To build food stocks, he imposed a heavy levy on rice mills. In the process, he alienated the business community. Shortages of essentials led to anti-Congress Party strikes. This was followed by violence and police excesses which further isolated Sen's government. In 1967, the Congress lost the West Bengal election to the Marxists with Sen losing his Arambagh seat in the
West Bengal Legislative Assembly as well. After this setback, Sen, although re-elected to the West Bengal Assembly, never recovered high political office. In the 1980s he fruitlessly espoused the cause of partyless democracy and, although he had left the Congress (I), having little sympathy for its leaders, came around to publicly supporting the party at public forums. ==Political legacy==