Arguably their careers are now both collectively and irreversibly ruined. Like the Nobel prize winner that invented some major form of fertilizer that turned out to be a nazi
He discovered the Haber process around 1911, which was well before WWII and it was intended for fertilizer only. Eventually people realized that mass ammonia production was very helpful for chemical warfare, and many (including French nobel winners like Grignard) engaged in it.
The Zyklon B synthesis is a red herring.