See, now I never knew about Flossenburg.
Messerschmidt plant in Augsburg too. It was still there when I left in 1983.
German Admiral Wilhelm Canaris, was executed at Flossenburg Prison 7Feb1945.
He was among conspirators who tried to assassinate Hitler. He was the Head of German Military Intelligence. He evaded getting exposed for his part until just before WWII ended.
I’ve read gruesome details of how he was executed.