“I often knew and heard of Jews, particularly from Western Europe, who revealed the addresses of those members of their race still in hiding. A Dutch Jewess, led naked into a crematory execution room, shouted out the address of a Jewish family just before she was shot. Another who, to judge by her clothing and deportment was of high status, gave me while still undressing a piece of paper which contained a long list of Dutch families who were concealing Jews. I don’t know what induced them to give such information….were they jealous that these other Jews might survive? Such incidents were multiplied many times over…”.
See also the “Kosher Confessions” section of Bibliography page on this site, and http://kpk-toronto.org/wp-content/uploads/collaboration.pdf