Of all the progressive prosecutors elected in American cities during the law-and-order Trump years, none embodied the hope for criminal-justice reform as perfectly as San Francisco’s Chesa Boudin. The son of the infamous political radicals Kathy Boudin and David Gilbert, Boudin grew up visiting his parents in prison, and began speaking publicly about the brutalities and racial inequities of the penal system when he was a teen-ager. Even by the standards of the criminal-justice-reform movement, he struck visionary notes in his 2019 campaign, calling for decarceration and declaring, on the night he won, “It’s time for radical change to how we envision justice.” Most of all, though, Boudin had San Francisco. The city’s lurid inequalities and radical political tradition meant that there was natural support for politics like his, as well as a district attorney’s office that has often been led by progressives—among them, Kamala Harris. If the country was to try a radical change in how it envisions justice, then surely this was the place.