The Shudras were excluded from rituals
Shudra or Shoodra is the lowest varna or one of the four social categories found in the texts of Hinduism. Various sources translate it into English as a caste, or alternatively as a social class. It is the lowest rank of the four varnas.
Unlike the members of the three dvija varnas—Brahmans (priests and teachers), Kshatriya, and Vaishya (merchants)—Shudras are not permitted to perform the upanayana, the initiatory rite into the study of the Vedas (earliest sacred literature of India).
Sudras (also Sudhra or Shudra) are people occupying a position next to the bottom of the Hindu caste system in India. Most Sudras are menial workers.