The Untouchables Who Were They And Why They Became Untouchables ? by B.R.Ambedkar
This book is a sequel to my treatise called The ShudrasWho they were and How they came to be the Fourth Varna of the Indo-Aryan Society which was published in 1946. Besides the Shudras, the Hindu Civilisation has produced three social classes whose existence has not received the attention it deserves.