German industrial complex and WW2

This is a very sensitive issue, what were the roles of those German industrial complex during the second world war, were they the real players behind the scene, I believe so far, no scholars study this topic seriously, yes we blame the Nazi, but if the industrial complex did not support the war, it was not easy for the Nazis to do this on their own.
And the Japanese industrial complex had been blamed and punished more or less, but this was the case of the German industrial complex?