"An overwhelming majority (seventy-five percent) of the present Indian Muslim population is called Dalit Muslims. Caste and untouchability are a lived reality for Muslims in South Asia, and untouchability is the community’s worst-kept secret. Many studies have claimed that concepts of ‘purity and impurity’; ‘clean and unclean castes’ definitely exist among Muslim groups. A 2009 study found there was not one ‘Dalit Muslim’ leader in any of the prominent Muslim organizations, which were dominated essentially by upper caste Muslims. In another 2015 study of seven thousand Dalit Muslim households across fourteen districts in Uttar Pradesh, many testified that they are seated separately at Muslim feasts. Respondents also confirmed that they eat only after the upper caste Muslims. Many said they are served food on separate plates. Around eight percent reported that their children are seated in separate rows in classes and also during school lunches. Similarly, at least a third of them stated that they are not allowed to bury their dead in an upper caste Muslim burial ground. They are told to go elsewhere or provided a corner of the main ground."
January 1, 1970
https://en.wikiquote.org/wiki/Caste_system_among_South_Asian_Muslims