After the First World War, the predominantly Polish provinces had to be ceded to the newly created Polish Republic. Polish-speaking minorities remained especially in Upper Silesia and parts of East Prussia. During the 1922 to 1937 term of the German-Polish Accord on Upper Silesia (Geneva Agreement), signed in Geneva on 15 May 1922, German nationals of Polish ethnicity in Upper Silesia had judicial status as a national minority under the auspices of the League of Nations (likewise the Poles of German ethnicity in the Polish Silesian Voivodeship). After the rise of the Nazis, all Polish activities were systematically constrained, since mid-1937 also in Upper Silesia. However, in August 1939, the leadership of the Polish community was arrested and interned in the Nazi concentration camps of Sachsenhausen and Buchenwald. On 7 September 1939, shortly after the outbreak of World War II, the Nazi government of the Third Reich stripped the Polish community in Germany of its minority status. This was formally confirmed by Hermann Göring's decree of 27 February 1940.