Marina Amaral, on her blog:
Witold Pilecki was a reserve officer in the Polish Army born 13 May 1901 in Olonets, Russia. During World War II while attached to a Polish resistance group, he volunteered for an operation that saw him intentionally imprisoned in Nazi Germany’s Auschwitz death camp in order to gather intelligence on the site’s operations. As early as 1941, Pilecki’s reports informed the Western Allies of the atrocities being committed at the death camp. Before escaping Auschwitz, Pilecki organized a resistance movement right under the noses of the camp’s Nazi German overseers, kapos and administrative staff.