Quanta Shanghai Manufacturing City (QSMC, ???????) would seem like an ideal site to implement China’s “closed loop” management system, meant to prevent the spread of COVID-19, that requires staff to live and work on-site in a secure bubble. Sprawled over land the size of 20 football fields, the campus houses factories, living quarters for 40,000 workers and a supermarket. Yet as COVID-19 breached Quanta’s defenses, the system turned into chaos on Thursday. Photo: Screenshot from Quanta’s Web site Videos posted online showed more than 100 Quanta workers physically overwhelming security guards in hazmat suits and vaulting over factory gates to...