Caste Sytem Among Early Tamils

Even at the time of writing I knew that the article would draw a lot of flak from Tamil Arvalars, literal translation of this is-one who is passionate in Tamil-,it is a different matter that they can not even pronounce the Tamil Zha, La and la properly. True to form I have received a communication that my information about Sanatana Dharma and Tamil is wrong and some research paper links were attached with the communication. The Tamil Land was divided, it is unique among all the civilizations, into five geographical entities.