Witold Pilecki - To prove that Auschwitz was killing people, not a labor camp, forged papers,entered a ghetto roundup, and was sent to Auschwitz. He redistributed food to prisoners, trained them in martial arts, and passed news out. He & a few others beat up guards, stole their clothes and left the camp carrying the guard's stolen papers. They were in the woods for 3 days, til they met up with the Home Army and passed the info on. This was the first evidence of the existence of death camps.
St. Maximilian Kolbe. A Polish Franciscan friar, Max was active in the Polish underground during WWII. Captured and sent to Auschwitz in 1941, he watched as ten men were selected for death after the supposed escape of another inmate. Knowing one of the men had a family still alive on the outside, St. Max volunteered to die in his stead. His offer was accepted, and he, along with the other nine, was starved for weeks, then killed by an injection of carbolic acid. He was canonized in 1982.