Irena Sendler was a Polish Catholic social worker who served in the Polish Underground and the Żegota resistance organization in German-occupied Warsaw during World War II.
Why am I writing about her? Irena assisted by some two dozen other Żegota members, saved 2,500 Jewish children from the Nazi camps by smuggling them out of the Warsaw Ghetto, providing them with false documents, and sheltering them in individual and group children's homes outside the Ghetto.
In 2007 she was nominated for the Nobel Peace Prize but some other guy from Intergovernmental Panel on Climate Change won instead (you may know him, he was the former Vice President of the United States, Al Gore).
Her regret in life was that she could have done more. RIP, Irene.
Full article on Wikipedia: http://en.wikipedia.org/wiki/Irena_Sendler