An elder from the Groningen Congregation, Klaas de Vries, was subjected to cruel, merciless interrogation by the Nazi Gestapo, placed in solitary confinement for 12 days with only bread and water, and then questioned again.
یکی از پیران جماعت خِرونینگِن به نام کلاؤس دِ فریس مورد بازجویی خشن و بی‌رحمانهٔ گشتاپوی نازی قرار گرفت .‏