The trio were jailed for two years each at the High Court in Glasgow

The High Court in Glasgow heard that Chinese gangsters had rented a house in Cambuslang to set up the factory.

Tu Trinh, 26, Long Pham, 22, and Quang Nguyen, 21, also entered the UK illegally to work in their farm.

Lord Uist recommended that the trio be deported back to Vietnam at the conclusion of their sentences.

He added: "No doubt there were others for whom you were working who stood to gain much more than you did in this operation but you were the farm labourers who carried out essential work to enable this operation to get underway."

The trio were convicted of being concerned in the supply of cannabis between 7 January and 12 January in a house at 106 Elder Crescent, Cambuslang.

Locating sites

The court heard that the factory had produced between �70,000 and �200,000 of cannabis.

It was being prepared to produce �1m worth of cannabis at the end of every eight-week growing cycle.

During the trial the jury were told of a Chinese man called Jian He, also known as Xiao Fan Yang, 25. He was said to be one of the main targets of a police drive called Operation League to clamp down on cannabis farms run by Oriental crime gangs.

Last month, also at the High Court in Glasgow, Yang admitted producing cannabis at four rented houses in Cambuslang and Glasgow.

Two of the three Cambuslang factories were in Hawthorn Way and the fourth in West Farm Grove. The Glasgow factory was in Ben Vorlich Drive.

The jury was told that Yang was involved in the acquisition of rented properties, locating potential sites, arranging leases and paying rents, usually in cash.

He will be sentenced later this month.