Tamil Nadu clarifies list of essential industries allowed to operate amid COVID-19 lockdown Food related, food processing industries including food and poultry, pets and animal husbandry, all export units, units which have export commitments or export orders and their vendor units providing inputs to such industries are allowed to operate Joe C Mathew | May 13, 2021 | Updated 17:25 IST Essential industries allowed to function in Tamil Nadu amid lockdown Guidance, the industrial guidance and export promotion agency of Tamil Nadu state government, has prepared clear set of charts for easy understanding of the industries that can continue to function during the statewide lockdown that is in force now. Confusion over the industries that are permitted or not permitted to function has been one of the major irritants for businesses in most states that have gone into COVID-19 related lockdown in the country.