Tadeusz Zaderecki was a Catholic Pole from Lwów (as the city was then known; now L'viv in Ukraine) with many connections in the city's Jewish community. He witnessed the violent Nazi campaign against the city's Jews and collected as much information as possible from Jewish and non-Jewish sources. At the end of the war, he turned his notes into a detailed historical account. Translated from the Polish, widely annotated, and with an introduction by Zaderecki's friend and Holocaust survivor Rabbi David Kahane, Lwów under the Swastika is a document that offers a comprehensive understanding of the Holocaust in Lwów.