Qatar’s largest labour camp for migrant workers has become a virtual prison and is in total lockdown after hundreds of construction workers became infected with Covid-19. Police are guarding the perimeter of a huge zone within the “Industrial Area”, leaving thousands of workers trapped in squalid, over-crowded camps, where the virus can spread rapidly. No one can enter or leave, say workers who live in the area, many of whom had been working on Fifa World Cup 2022 infrastructure projects.