A whistleblower who exposed illegal working conditions in a factory making Amazon’s Alexa devices says he was tortured before being jailed by Chinese authorities. Tang Mingfang, 43, was jailed after he revealed how the Foxconn factory in the southern Chinese city of Hengyang used schoolchildren working illegally long hours to manufacture Amazon’s popular Echo, Echo Dot and Kindle devices. Now, after spending two years in prison, he is appealing to the higher courts to clear his name. He has taken the difficult decision to talk publicly, despite being aware of…