During World War II the workers of the Mokotow Institute in Ksawerow saved many people of Jewish origin. Thanks to the initiative of the head manager Wladyslaw Sala, the institute gained the permission to employ the ghetto’s inhabitants. The real motif of those efforts was to give Jews the opportunity to cross to the “Arian side” and give them the possibilities to survive the war. On 5th September 1991, in the Ksawerow park, a memorial stone was unveiled with the inscription : “The stone commemorates saving Jews from Nazi extermination by the workers of the Mokotow Institute on Ksawerow farm. Warsaw 1991”.