In Indian constitution, there are list of castes are included in Govt Gazzete to be regarded in the category of Scheduled Caste or Schedules Tribes. If any caste not figuring in the list cannot be called as Sc or St. So caste is the main criteria as per Govt rules. Govt gives jobs quota if they are figured in Sc or St category. For monitory benefit they can be called in their caste name but not in film songs. What a tamasha these politicians making for their own benefit.
