It’s impossible to say when Bonhoeffer joined the conspiracy, mainly because he was always in the midst of it, even before it could have been called a conspiracy. The Bonhoeffer family had relationships with many powerful people in the government, most of whom shared their anti-Hitler views. Karl Bonhoeffer was close to Ferdinand Sauerbruch, a famous Berlin surgeon who was anti-Nazi and who influenced Fritz Kolbe, a German diplomat, to join the Resistance. Kolbe became America’s most important spy against Hitler.
