In this episode, we reflect on the rise, evolution, and legacy of Barcelona en Comú, the emblematic movement-party that governed the city of Barcelona from 2015 to 2023. Joined by long-time activist and former political advisor Elia Gran, as well as researchers Silke van Dyk and Luzie Gerstenhöfer (University of Jena), the conversation explores the key ambitions, successes, and tensions of this bold experiment in municipalist governance. The episode draws from the sociological research project „Public Politics and the Future of the Commons“ to unpack strategic shifts in areas like housing, municipalization of public services as well as social and economic policies. Together, the guests consider what can be learned from the Comuns’ experience, how the party related to social movements and class politics. Now that the Comuns are out of office, the time is ripe for a candid assessment beyond their frequent representation as a European lighthouse case for alternative local politics: What did the municipalist turn achieve—and where did it fall short? Tune in for a rich researcher-activist dialogue on the possibilities and pitfalls of transforming politics from the ground up.