Answer
The Congress Prime Minister supported by Dange was Indira Gandhi, who served as India's Prime Minister from 1966 to 1977 and again from 1980 to 1984. Dange, a prominent communist leader and a founding member of the Communist Party of India (CPI), supported Gandhi's policies, particularly her socialist and pro-poor initiatives, such as bank nationalization and land reforms, which aligned with the CPI's ideological goals.