Answer
Periyar, a social reformer from South India, vehemently opposed the principle of casteism, which segregates individuals based on their birth into different social classes. He strongly advocated for social equality and the eradication of this discriminatory system that perpetuates social hierarchies and injustices. Periyar's teachings and actions were dedicated to promoting self-respect, rational thinking, and the upliftment of marginalized communities, challenging the oppressive caste-based societal norms prevalent during his time.