Charvakas (not Chakravas as wirtten byyou) were not any caste. They were atheists during vedic period.
There were no caste system in Vedic period. The caste systems (developed on the basis of occupation/profession) came into force much later. Later on that degenerated into untouchablity, etc. The same has now been abolished by law in India but may continue for some time, mainly due to the caste based reservation. Adopt economic creteria as the basis of givng some kind of reservation (if at all required) and the caste system will disappear in less than 10 years.
