A damning account of the latest transformation in mass incarceration, revealing how powerful nonprofits and so-called progressives used the language of social movements to build new jails. In 2019, after unyielding pressure from activists, New York City seemed poised to close the detested Rikers Island penal colony. The local press dutifully reported that the end of Rikers was imminent, and New Yorkers celebrated the closure of the country’s largest urban jail, condemned as a moral stain on an otherwise great city. The problem, however, was that the city had not actually committed to closing Rikers. And at the same time, it laid the groundwork for the construction of more jails, a network of skyscraper facilities amounting to the largest carceral construction the city has seen in decades. How did this happen? In Skyscraper Jails, scholars and organizers Jarrod Shanahan and Zhandarka Kurti detail how progressive forces in New York City appropriated the rhetoric of social movements and social justice to promise “downsized” and “humane” jails. The principal advocates of these new jails were not right-wing politicians, but prominent city activists and progressive non-profit organizations. As the political coalition that campaigned for the new jails fans out across the United States, the story at the heart of Skyscraper Jails is at once a case study and a cautionary tale for what will be coming to cities and towns across the United States and beyond.