Life for the eight people in the small apartment, which Anne Frank referred to as the Secret Annex, was tense. The group lived in constant fear of being discovered and could never go outside. They had to remain quiet during daytime in order to avoid detection by the people working in the warehouse below. Anne passed the time, in part, by chronicling her observations and feelings in a diary she had received for her 13th birthday, a month before her family went into hiding.
For two years, they lived in a secret attic apartment behind the office of the family-owned business at 263 Prinsengracht Street, which Anne referred to in her diary as the Secret Annex. Otto Frank’s friends and colleagues, Johannes Kleiman, Victor Kugler, Jan Gies and Miep Gies, had previously helped to prepare the hiding place and smuggled food and clothing to the Franks at great risk to their own lives.
Nazi Germany maintained concentration camps (German: Konzentrationslager, KZ or KL) throughout the territories it controlled before and during the Second World War. The first Nazi camps were erected in Germany in March 1933 immediately after Hitler became Chancellor and his Nazi Party was given control of the police by Reich Interior Minister Wilhelm Frick and Prussian Acting Interior Minister Hermann Göring. Used to hold and torture political opponents and union organizers, the camps initially held around 45,000 prisoners. In 1933–1939, before the onset of war, most prisoners consisted of German Communists, Socialists, Social Democrats, Roma, Jehovah's Witnesses, homosexuals, and persons accused of 'asocial' or socially 'deviant' behavior by the Germans.