When did the Third Reich realize that Dietrich Bonhoeffer was not going to get on board? Williams Kuhns writes…

The Church struggle was an effort of the churches to remain independent and to keep to their work of preaching the Word. Bonhoeffer saw the conflict coming with the very installation of Adolf Hitler as Chancellor on January 30, 1933. Two days later Bonhoeffer gave a radio address on “Changes in the Conception of the Leader of the Younger Generation,” in which he warned that a fixation to the person rather than the office would lead to idolatry. The radio message was cut short, and from the onset Bonhoeffer was labelled an enemy of the Third Reich.

(William Kuhns, In Pursuit of Dietrich Bonhoeffer48).