The radical libertarian city builders of the tech-bro set have an audacious new proposal: They want to convert Guantánamo Bay, host to the infamous prison, into the high-tech charter city of their wildest imaginations, which will double as a “proving ground” for migrants seeking to enter the United States. The Charter Cities Institute, or CCI, which has lobbied the Trump administration on setting up so-called freedom cities in the U.S, suggests the president take advantage of Guantánamo’s special legal status to convert the controversial detention camp into “a beacon of 21st-century prosperity.”