Russia used to have a lot of Volga Germans.
Stalin persecuted the Volga Germans and when the war with Germany began in 1941, he deported most of them to Siberia, Kazakhstan, and other eastern regions. Others moved to Germany after the Nazis overran their neighborhoods, but many of these were forcibly returned by the Allies to the Soviet Union, where they were herded into the Gulag. Some of the Volga Germans in Germany eluded the roundup and became citizens of the Federal Republic of Germany.