This is nothing compared to Hinduism's varna system(caste system), where the entire society is split in to 4 groups and learning to read and write is banned to

This is nothing compared to Hinduism's varna system(caste system), where the entire society is split in to 4 groups and learning to read and write is banned to the bottom 3 groups. Even the skills of one group is prohibited to be learned by the other.