Toward the end of the Obama presidency, the work of James Baldwin began to enjoy a renaissance that was both much overdue and comfortless. Baldwin stands as one of the greatest American writers of the twentieth century, and any celebration of his work is more than welcome. But it was less a reveling than a panic. The eight years of the first black president were giving way to some of the most blatant and vitriolic displays of racism in decades, while the shooting deaths of Trayvon Martin, Michael Brown, and others too numerous to list sparked a movement in defense of black lives. In Baldwin, people found a voice from the past so relevant that he seemed prophetic.

More than any other writer, Baldwin has become the model for black public-intellectual work. The role of the public intellectual is to proffer new ideas, encourage deep thinking, challenge norms, and model forms of debate that enrich our discourse. For black intellectuals, that work has revolved around the persistence of white supremacy. Black abolitionists, ministers, and poets theorized freedom and exposed the hypocrisy of American democracy throughout the period of slavery. After emancipation, black colleges began training generations of scholars, writers, and artists who broadened black intellectual life. They helped build movements toward racial justice during the late nineteenth and twentieth centuries, whether through pathbreaking journalism, research, or activism.

On a Friday afternoon in the fall of 2017, a few months after the liberation of Mosul from the Islamic State, a group of neighbors gathered at Mar Mattai, a monastery founded in the fourth century. They unloaded baskets of food, and arranged themselves around a long table in a courtyard. A woman named Niser spread out a tablecloth and put down a plate of dolmas. “It’s a way of celebrating that we still exist,” she told me. More people were arriving—children, grandparents, cousins, aunts, and distant relations—members of one of the oldest Christian communities in the world who had not seen one another for three years.

Around three in the morning on a cold December Sunday, brothers José and Romel Sucuzhañay began to walk home from a bar in Bushwick, Brooklyn. It was a cloudy night, only a few degrees above freezing, and the houses and stores lining their route wore impassive, nighttime guises—shades drawn, metal grates locked down. Romel had only recently arrived from Ecuador. José, a thirty-­one-year-old father of two, ran a successful real estate agency in the neighborhood. The two had spent the evening eating and drinking at a quinceañera at St. Brigid Church, and afterward, they stopped at a local bar called Christopher’s Palace. They were feeling the alcohol as they headed back to José’s apartment. When they realized that José had left his coat behind in the bar, Romel took off his jacket and draped it around his younger brother’s shoulders. They continued to walk up Bushwick Avenue, swaying a bit, arms around each other for warmth and ballast.

As they approached the corner of Kossuth Place and Bushwick Avenue, a red SUV stopped at the traffic light. “Check out those faggots!” the driver yelled out the window. José may have said something in reply. Very rapidly, a man jumped out of the passenger side door and smashed José on the head with a bottle, dropping him to the ground. He then turned to attack Romel. As Romel fled from the man down Kossuth, the driver exited the car, grabbed an aluminum baseball bat out of the vehicle, and began to beat José until someone emerged from the back seat and called him off. The driver was walking away when he saw some movement from José, a twitch of his hand or his leg sliding across the pavement—trying to rise, perhaps—and he strode back, straddled him, and raised the bat high in the air. He brought it down on José’s head, again and again, as if he were chopping wood.

After eighteen-year-old Michael Brown was shot and killed by a police officer in Ferguson, Missouri, Bergis Jules found himself worrying not only over the horrors of the present, but also over how little of the present was likely to be preserved for the future. The best reporting on the aftermath in Ferguson was being produced by activists on Twitter, a notoriously ephemeral medium. Jules, then an archivist at the University of California, Riverside, had the impulse to start saving tweets, but wasn’t sure how. “That whole weekend, watching things unfold, I thought, ‘This is a really amazing historical moment; we should think about capturing it,’ but I was just talking to myself,” he says. The following week, attending a Society of American Archivists conference in Washington, D.C., he voiced his fears en route to drinks at the hotel bar. He caught the ear of Ed Summers, a developer who just so happened to be the author of a Twitter archiving tool—and who promptly programmed it to va­cuum up #Ferguson tweets. Within two weeks, he had amassed more than 13 million.

Three weeks after the shooting, Summers blogged about the archive, which he and Jules were considering making public. Shortly thereafter, they received an inquiry from a data-mining company. When they pulled up the firm’s website, they read that its clients included the Department of Defense and, ominously, “the intelligence community.” What did the company want with the data? And what were the ethical implications of handing it over—perhaps indirectly to law enforcement—when the protesters’ tweets would otherwise evade collection? Using Twitter’s Application Programming Interface (API), the code that developers use to call up Twitter data, anyone can sift through tweets that were posted in the past week, but older posts disappear from the API’s search function, even if they still exist out on the web. The data-mining company was too late to nab a swath of the #Ferguson tweets. (Twitter has since unveiled a “premium” API that allows access to older data, for a substantial fee.) Newly mindful of the risks, Jules and Summers waited almost a year to publish their cache.