In 1933, after Adolf Hitler's Nazi Party won the federal election and Adolf Hitler was appointed Chancellor of the Reich, Edith Frank and the children went to stay with Edith's mother Rosa in Aachen. Otto Frank remained in Frankfurt, but after receiving an offer to start a company in Amsterdam, he moved there to organize the business and to arrange accommodations for his family. He began working at the Opekta Works, a company that sold the fruit extract pectin. Edith travelled back and forth between Aachen and Amsterdam and found an apartment on the Merwedeplein (Merwede Square) in the Rivierenbuurt neighbourhood of Amsterdam, where more Jewish-German refugees settled. In late December 1933, Edith followed her husband together with Margot. Anne stayed with her grandmother until February, when the family was reunited in the Netherlands. The Franks were among 300,000 Jews who fled Germany between 1933 and 1939.