people suffering from mental and physical disabilities, as well as a number of concentration camp inmates, were murdered at Sonnenstein killing centre near Pirna. As World War II drew to its end, U.S. troops under General George Patton occupied the western part of Saxony in April 1945, while Soviet troops occupied the eastern part. That summer, the entire state was handed over to Soviet forces as agreed in the London Protocol of September 1944. Britain, the US, and the USSR then negotiated Germany's future at the Potsdam Conference. Under the Potsdam Agreement, all German territory East of the Oder-Neisse line was annexed by Poland and the Soviet Union, and, unlike in the aftermath of World War I, the annexing powers were allowed to expel the inhabitants. During the following three years, Poland and Czechoslovakia forcibly expelled German-speaking people from their territories, and some of these expellees came to Saxony. Only a small area of Saxony lying east of the Neisse River and centred around the town of Reichenau was annexed by Poland. Traditional close relations of Saxony with neighbouring German-speaking Egerland was thus completely destroyed, making the border of Saxony along the Ore Mountains a linguistic border. Part of the former Prussian province of Lower Silesia lay west of the Oder-Neisse line and therefore was separated from the bulk of its former province; the Soviet Military Administration in Germany (SVAG) merged this territory into Saxony. This former Silesian territory broadly corresponded with the Upper Lusatian territory annexed by Prussia in 1815. On 20 October 1946, SVAG organised elections for the Saxon state parliament (), but many people were arbitrarily excluded from candidacy and suffrage, and the Soviet Union openly supported the Socialist Unity Party of Germany (SED). The new minister-president Rudolf Friedrichs (SED), had been a member of the SPD until April 1946. He met his Bavarian counterparts in the U.S. zone of occupation in October 1946 and May 1947, but died suddenly in mysterious circumstances the following month. He was succeeded by Max Seydewitz, a loyal follower of Joseph Stalin. The German Democratic Republic (East Germany), including Saxony, was established in 1949 out of the Soviet zone of Occupied Germany, becoming a constitutionally socialist state, part of COMECON and the Warsaw Pact, under the leadership of the SED. In 1952 the government abolished the Free State of Saxony, and divided its territory into three : Leipzig, Dresden, and Karl-Marx-Stadt