which people working for mr. frank knew about the secret annexe?

Mr. Koophius

A Dutch associate of Mr. Frank's who arranges for them to live in the annex. He provides them with food and, through enormous effort, keeps their secret for two years. He is captured with the Franks and the Van Daans but released for medical care due to his health problems.

Mr. Kraler

Another Dutch associate of Mr. Frank's who arranges for the living situation in the annex. Along with Mr. Koophius, he bears the brunt of responsibility for their secret. He, too, is arrested for his role in helping the annex residents. He spends eight months in a forced labor camp.

Miep

A Dutch woman who assists the annex residents with food, clothing, books, and companionship. She cheerfully assists them with the things they need and pitches in to give them holidays. Along with Elli, she retrieves and saves Anne's diary from the floor after the annex residents are arrested.

Elli

A Dutch woman who does chores and finds food and clothing for the annex residents, as well as arranging for illegal goods and coupons. She often gives Anne and Margot office work, to prevent them from being bored. Along with Miep, she retrieves and saves Anne's diary from the floor of the annex after the residents are arrested.