"On Auschwitz" (51): Illegal letters sent by Auschwitz prisoners

Prisoners of Auschwitz were able to send various types of illegal
messages—both within the camp and outside the barbed wire fences.
Some were short letters addressed to family members; others were
messages and reports for underground resistance organizations.
Dr. Wojciech Płosa, the head of the Auschwitz Museum Archives,
discusses this unique collection of documents.