José M. Faraldo is associate professor in the department of Modern and Contemporary History at the Universidad Complutense de Madrid (UCM). He worked from 1997 to 2002 at the European University Viadrina, in Frankfurt/Oder (Germany) and from 2004 to 2008 he was research fellow and project coordinator at the Center of Research on Contemporary History, (Zentrum für Zeithistorische Forschung, ZZF), in Potsdam (Germany). He has published extensively on the subject of nationalism, communism, resistance against fascism and communism, exiles from dictatorships and the archives and legacy of the communist secret police. Most recent books: Contra Hitler y Stalin. La Resistencia en Europa (1936-1956), Madrid: Alianza 2022; Collapsed Empires. The Consequences of 1917 in Europe and the Mediterranean, Zurich: Lit Verlag 2020. Gutmaro Gómez Bravo is associate professor in the department of Modern and Contemporary History at the Universidad Complutense de Madrid. He is a member of the Civil War and Francoism Research Group. His broad areas of interest are political violence, penal and penitentiary systems, social history and repression. He is the author of various monographs Esclavos del Tercer Reich. Los españoles del campo de Mauthausen. Madrid, Catedra 2022 (with Diego Martinez); Hombres sin nombre. La reconstrucción del socialismo en la clandestinidad (1939-1970). Madrid., Cátedra 2021; (ed) Asedio. Historia de Madrid en la Guerra Civil. Madrid, Ediciones Complutense 2018; Geografía Humana de la represión franquista. Del golpe a la guerra de ocupación. (1936-1941), Madrid, Cátedra 2017.