What incidents prompts anne's family to move into hiding?

After 1940, Hitler conquered Holland and brought anti-Jewish measures there. Jews were forced to wear yellow stars as marks of identification; they had to hand in their bicycles and were not allowed to use trams or public facilities. They were segregated into Jewish shops and Jewish schools and not allowed to visit Christian homes. As Anne says, "Our freedom was strictly limited." Mr. Frank's business is doing poorly, as no one will do business with a Jew.

The first line for Anne's entry of July 8 lets us know that something crucial has happened: "Years seem to have passed between Sunday and now." At three o'clock on Sunday afternoon, she was reading on the verandah, waiting for Harry to come visit her. When the doorbell rings, she barely notices it. Her sister Margot comes to her, very excited, and says that the SS has sent up a call notice for Mr. Frank. Anne is instantly frightened--a call-up notice means "concentration camps and lonely cells."

In the privacy of their bedroom, Margot tells Anne that the call-up notice was for her, not for Mr. Frank. Anne is horrified that the SS would call a sixteen-year-old girl alone. With questions swirling in her head, she begins packing "the craziest things" into a school satchel in preparation to go into hiding. At five o'clock Mr. Frank arrives, and the speed of the preparations picks up. They leave the next morning, wearing layers and layers of clothes. ("No Jew in our situation would have dreamed of going out with a suitcase full of clothing," Anne explains.) Only Anne's cat is left behind.