I must have been remembering that his research between the World Wars lead to the development of Zyklon B muddled that up with some other chemist (maybe Otto Ambros?). I’ll see if I can find my source.

Edit: probably Richard Kuhn who fell into line and fired Jewish coworkers at the direction of the Nazis or Herman Kolbe who was an outspoken German nationalist and anti-Semite. I use all three of them as examples of prominent scientists behaving badly in my O-Chem course.