D. Pandian was a prominent Indian politician and a significant figure in the Communist movement, particularly in the state of Tamil Nadu. He dedicated his life to advocating for the rights of workers, farmers, and marginalized communities. Pandian was a longtime member of the Communist Party of India (CPI), holding various leadership positions within the party structure throughout his career. He served as the Tamil Nadu State Secretary of the CPI for an extended period, a role in which he played a crucial part in shaping the party's policies and strategies in the region.

Pandian's political activism was deeply rooted in his commitment to social justice and equality. He was a vocal critic of economic disparities and fought for policies aimed at improving the living conditions of the working class. He actively participated in numerous protests and agitations against policies he believed were detrimental to the interests of the common people. His speeches and writings often reflected his deep understanding of socioeconomic issues and his unwavering dedication to socialist principles.

Beyond his party activities, D. Pandian was also a respected parliamentarian. He was elected to the Lok Sabha, the lower house of the Indian Parliament, representing a constituency in Tamil Nadu. During his tenure as a Member of Parliament, he consistently raised issues of public concern, particularly those affecting the agricultural sector and the welfare of laborers. He was known for his articulate and passionate interventions in parliamentary debates, advocating for policies that would promote inclusive growth and social justice. His contributions to parliamentary discourse were widely acknowledged and respected across party lines. He remained an influential figure in Tamil Nadu politics until his passing, leaving behind a legacy of dedicated service and unwavering commitment to the principles of communism.