Who were the Shudras

The general proposition that the social organization of the Indo-Aryans was based on the theory of Chaturvarnya and that Chaturvarnya means division of society into four classes-Brahmins (priests), Kshatriyas (soldiers),Vaishyas (traders) and Shudras (menials) does not convey any idea of the real nature of the problem of the Shudras nor of its magnitude. Chaturvarnya would have been a very innocent principle if it meant no more than mere division of society into four classes. Unfortunately, more than this is involved in the theory of Chaturvarnya. Besides dividing society into four orders, the theory goes further and makes the principle of graded inequality. 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.
ABOUT THE AUTHOR:
Bhimrao Ramji Ambedkar (14 April 1891 — 6 December 1956), popularly known as Babasaheb, was an Indian jurist, economist, politician and social reformer who inspired the Modern Buddhist Movement and campaigned against social discrimination in India, striving for equal social rights or Dalits, women and labour. He was independent India's first law minister and the principal architect of the Constitution of India.
Ambedkar was a prolific student, earning a law degree and various doctorates from Columbia University and the London School of Economics, and gained a reputation as a scholar for his research in law, economics and political science. In his early career he was an economist, professor, and lawyer. His later life was marked by his political activities, where he became involved in the negotiations for India's independence campaigning by publishing journals advocating political rights and social freedom for untouchables and contributing significantly to the establishment of the state of India. In 1956 he converted to Buddhism, initiating mass conversions of Dalits. In 1990, Ambedkar was posthumously conferred with the Bharat Ratna, India's highest civilian award. Ambedkar's legacy includes numerous memorials and depictions in popular culture.