Werner Klemperer, himself was a refugee from Nazi Germany, two Emmys for his role as inept camp commander Klink.
Read about the rest of the cast, it’s pretty interesting (Pay no attention to the title):
https://www.neatorama.com/2014/05/05/Hogans-Heroes-TVs-Most-tasteless-Sitcom/
As were both John Banner (Sgt. Schultz) and Leo Askin (General Burkhaltar). Ask in came to the US in 1940 and served in the Army Air Foce during WWII.
It was interesting to find out that the original premise for the show was to have it based on an American prison in which the prisoners would outwit the prison warden and guards while allowing inmates to escape.
I can see why they didn't think that concept would go over very well with the American public.
He also played one of the defendants in Judgement At Nuremberg. Klemperer would agree to play Nazis on TV only if they were A) obviously evil, or B) comically inept.