I know even senior officials claim they did not know the official policy in Germany was to exterminate the Jews but is there any reliable data on how many Germans knew the objective?
I don't believe there is, as it's not exactly easy to prove someone knew a specific fact. But it can be assumed everyone working at (or living near) the KZ and Vernichtungslager knew about their purpose, as well as the Reichsbahn employees involved in the transports.
