Bonhoeffer was very influential with the international church to shine the light on the evil that was afoot.
He was in the US and could have stayed but decided to return to help the German church and German people.
He was torn about getting involved directly with resistance but slowly grew more involved as the war progressed.
Tragically he was executed on the cusp of Germanys defeat.
Eric Mataxis biography on him is extremely good.
Rabbi Elchonon Wasserman returned to Poland to be there for his students. He was murdered in 1941 by guess who.
There’s a quality of greatness that transcends parochial denominations. Where a Gandhi, a Mother Theresa or a Pastor Dietrich Bonhoeffer or a Rabbi Elchanan Wasserman meet and are comrades. It doesn’t always require martyrdom, but often does.