it remained in Germany, as part of the Province of Upper Silesia. In the interwar period, Bytom was one of two cities (alongside Kwidzyn) in Germany, in which a Polish gymnasium was allowed to operate. In 1923 a branch of the Union of Poles in Germany was established in Bytom. There was also a Polish preschool, two scout troops and a Polish bank. In a secret Sicherheitsdienst report from 1934, Bytom was named one of the main centers of the Polish movement in western Upper Silesia. Polish activists were persecuted since 1937. The Bytom Synagogue was burned down by Nazi German SS and SA troopers during the Kristallnacht on 9–10 November 1938. Before 1939, the town, along with Gleiwitz (now Gliwice), was at the southeastern tip of German Silesia. World War II and post-war period During the German invasion of Poland, which started World War II, the Germans carried out mass arrests of local Poles. On September 1, 1939, the day of the outbreak of the war, Adam Bożek, the chairman of the Upper Silesian district of the Union of Poles in Germany, was arrested in Bytom and then deported to the Dachau concentration camp. The Germans carried out revisions in the Polish gymnasium and the local Polish community centre, 20 Polish activists were arrested on September 4, 1939, then released and arrested again a few days later to be deported to the Buchenwald concentration camp. Also three Polish teachers, who had not yet fled, were arrested, while the assets of the Polish bank were confiscated. The Einsatzgruppe I entered the city on September 6, 1939, to commit atrocities against Poles. Many Poles were conscripted to the Wehrmacht and died on various war fronts, including 92 former students of the Polish gymnasium. The Beuthen Jewish community was liquidated via the first ever Holocaust transport to be exterminated at Auschwitz-Birkenau. The Germans operated a Nazi prison in the city with a forced labour subcamp in the present-day Karb district. There were also multiple forced labour camps within the present-day city limits, including six subcamps of the Stalag VIII-B/344 prisoner of war camp. In 1945 the city was transferred to Poland as a result of the Potsdam Conference. Its German population was largely expelled by the Soviet Army and the remaining indigenous Polish inhabitants were joined mostly by Poles repatriated from the eastern provinces annexed by the Soviets. In 2017, the Tarnowskie