The Almighty Allah has decided and announced in the Qur’an that the whole mankind is a single nation. The Almighty further says that it is only Mushriks (polytheists) who are bad. He also explains that lowly and illegitimate are those who are disobedient and haughty. In spite of all this clarification whole of the Muslim society is going against the decision of the Almighty. They term many human beings as "kamīn" (lowly). They do not allow them to be known with their tribe name. We have therefore in our society classes of people like blacksmiths, carpenters etc. We refer to the people by these names derogatively. Isn’t it following Hindu caste system? This situation becomes more terrible when we see that not even a single sect, scholar or religious party notices this issue. I think all the sects like Shia, Brelvi, Ahl-e-hadith, Dew-bandi etc. are unanimous on this base custom.