Witold Pilecki - the only person who volunteered to be imprisoned in Auschwitz, organised a resistance inside the camp and as a member of Armia Krajowa sent the first reports on the camp atrocities to the Polish Government in Exile, from where they were passed to the rest of the Western Allies.
Witold Gombrowicz (1904 - 1969) was a renowned Polish novelist, his works were 'characterized by deep psychological analysis' and he's considered one of the best writers from Poland.