ヴィルヘルム・カナリス
Schlabrendorff was arrested following the failed 20 July Plot. He was sent to Gestapo prison where he was tortured, but refused to talk. While imprisoned he met fellow imprisoned co-conspirators Wilhelm Canaris, Hans Oster, Ulrich von Hassell, Johannes Popitz, Carl Goerdeler, Josef Mueller, and Alexander von Falkenhausen.