“Under the system of Chaturvarnya, the Shudra is not only placed at the bottom of the gradation but he is subjected to innumerable ignominies and disabilities so as to prevent him from rising above the condition fixed for him by law. Indeed until the fifth Varna of the Untouchables came into being, the Shudras were in the eyes of the Hindus the lowest of the low. This shows the nature of what might be called the problem of the Shudras. If people have no idea of the magnitude of the problem it is because they have not cared to know what the population of the Shudras is. Unfortunately, the census does not show their population separately. But there is no doubt that excluding the Untouchables the Shudras form about 75 to 80 per cent of the population of Hindus.”
Thus writes Dr B.R. Ambedkar in his seminal work, Who Were the Shudras: How They Came to be the Fourth Varna in the Indo-Aryan Society (1946), where he situates the degraded socio-cultural position of the Shudras (almost all the individual caste groups known as Other Backward Classes (OBC) in constitutional parlance today as well as some others belong to this historical-social category mentioned in both historical and literary texts).