Planck began his intercession on behalf of Haber, even going so far as to say that without the latter’s chemical process for obtaining ammonia from the nitrogen of the air “the previous war would have been lost from the beginning.” To this remark Hitler retorted: “I have nothing at all against the Jews themselves. But the Jews are all Communists, and these are my enemies — it is against these that I am fighting.”^1^

(Source.)