I think this is a play called The Fire Raisers...which I saw performed a couple of years ago. The production was fairly amateurish but the play survived, which I guess reflects its strength.Really, I can't understand why it is that some authors go out of fashion when they seem so obviously to stand whatever test of time should prevent their becoming victims of that.
This is a brilliant play, and has great messages for us right now, but your chances of seeing it are about nil. And apparently if you want to read it, you have to be able to speak German. What a pity.