All of the major German roles in Hogan’s Heroes were played by Jews.
Robert Clary was a Holocaust Survivor, who still gives lectures on how life was during that time.
Top German brass in show wanted to insure the roles they were playing as Germans never succeeded in their efforts. The top three all had successful 40 yr careers B4 hand, yet these roles defined them. Rare, for 1 in a show, but three of three in the same series...great actors.