Answer
West Bengal served as the location where Mithun Chakraborty formally joined the Bharatiya Janata Party (BJP), a prominent political party in India. This significant event marked Mithun's official affiliation with the BJP and symbolized his commitment to their principles and ideologies. By joining the party in West Bengal, Mithun became an integral part of the BJP's political landscape in the state and contributed to their efforts in various capacities.