Dehradun, Sept. 23 -- Interestingly, in the successful, and no less in significance, management of Doon tea estates, important roles were played by three categories of people, none of whom were native to the Valley. The tea estates were owned by the British, while the manual work on the tea plantations were carried out by "Purbiya" labour, especially got from eastern United Provinces (present Uttar Pradesh). The security of the estate and its extensive properties was in the hands of Gorkhas who had only a few decades earlier fought the British at Nalapani and Khalanga and subsequently a number of them settled in the Valley. It was only at a later stage that tea estates changed ownership with the entry of landed native gentry in some of th...