At the same time, a parallel regime was established under the strict control of the Western powers in the zones of post-war Germany occupied by them, culminating in the foundation of the Federal Republic of Germany in 1949, which initially claimed to be the sole legitimate power in all of Germany, East and West. The material standard of life in the Western zones of Berlin began to improve quickly, and residents of the Soviet Zone soon began leaving for the West in large numbers, fleeing hunger, poverty and repression in the Soviet Zone for a better life in the West. Soon residents of other parts of the Soviet Zone began to escape to the West through Berlin, and this migration, called in Germany "Republikflucht", deprived the Soviet Zone not only of working forces desperately needed for post-war reconstruction, but disproportionately highly educated people, which came to be known as the "Brain Drain".