Only one hit on Google, there may be more lyrics:

"We didn't know" said the Burgermeister
"about the camp out side of town,
it was Hitler and his crew
who tore the German nation down.
We didn't see a thing.
We didn't know at all.
Sure the cattle cars rumbled through.
And maybe they carried a Jew or two.
But we didn't know.
Oh what a terrible shame.
But you can't hold us to blame.
Oh no not us, we didn't know."