International Auschwitz Committee.

The Internationale Auschwitz Komitee was founded in 1952 by former inmates of the death camp, Auschwitz-Birkenau, with the following aims: to bear witness to the crimes of the Nazis in the camp; to fight for compensation for former inmates and their families; to work with the Auschwitz Museum to preserve the site of the camp as a permanent memorial. It became involved in the gathering of statements and testimony against former camp guards and other Nazi personnel. Many of the witnesses who provided testimony later took part in the 'Frankfurt Trial' of perpetrators at Auschwitz.

From the guide to the International Auschwitz Committee: Copy statements regarding war criminals, 1959, (Wiener Library)

...