Dr. B.R. Ambedkar
Jurist, economist, and principal architect of India's Constitution. Born into an "untouchable" caste, he turned scholarship into a weapon against it — leading the Mahad and temple-entry satyagrahas, writing Annihilation of Caste, securing safeguards for the oppressed, and in 1956 embracing Buddhism with half a million followers. Educate, Agitate, Organise.