By the fall of 1933, Otto Frank moved to Amsterdam, where he established a small but successful company that produced a gelling substance used to make jam. After staying behind in Germany with her grandmother in the city of Aachen, Anne joined her parents and sister Margot (1926-45) in the Dutch capital in February 1934. In 1935, Anne started school in Amsterdam and earned a reputation as an energetic, popular girl.
In 1958, at a performance of The Diary of Anne Frank in Vienna, Simon Wiesenthal was challenged by a group of protesters who asserted that Anne Frank had never existed, and who challenged Wiesenthal to prove her existence by finding the man who had arrested her. Wiesenthal indeed began searching for Karl Silberbauer and found him in 1963. When interviewed, Silberbauer admitted his role, and identified Anne Frank from a photograph as one of the people arrested. Silberbauer provided a full account of events, even recalling emptying a briefcase full of papers onto the floor. His statement corroborated the version of events that had previously been presented by witnesses such as Otto Frank.
Auschwitz became a significant source of slave labor locally and functioned as an international clearing house. Of 2.5 million people who were deported to Auschwitz, 405,000 were given prisoner status and serial numbers. Of these, approximately 50 percent were Jews and 50 percent were Poles and other nationalities. Of those who received numbers, 65,000 survived. It is estimated that about 200,000 people passed through the Auschwitz camps and survived.
The first camp in Germany, Dachau, was founded in March 1933. The press announcement said that "the first concentration camp is to be opened in Dachau with an accommodation for 5,000 people. All Communists and – where necessary – Reichsbanner and Social Democratic functionaries who endanger state security are to be concentrated there, as in the long run it is not possible to keep individual functionaries in the state prisons without overburdening these prisons." Dachau was the first regular concentration camp established by the German coalition government of National Socialist Workers' Party (Nazi Party) and the Nationalist People's Party (dissolved on 6 July 1933). Heinrich Himmler, then Chief of Police of Munich, officially described the camp as "the first concentration camp for political prisoners."