The ghetto was fully liquidated
Kraków's Jews were imprisoned in the Kraków Ghetto six months after German troops invaded Kraków. The ghetto was fully liquidated in 1943. Those considered useful (to be used as slave labor) were sent to Płaszów, including Schindler's workers and Stern. The rest were sent to various death camps across Poland. In Płaszów, Stern and his brother Natan, along with Mietek Pemper and Joseph Bau, were forced to work in Płaszów's office, where they came into frequent contact with the camp's notorious commandant, Amon Göth. Stern helped Pemper in his efforts to prevent the closure and liquidation of Płaszów, knowing that while conditions there were terrible, liquidation likely meant the deaths of every prisoner. Stern kept in contact with Schindler throughout this time and worked to better conditions for the Jews, including transferring workers to Schindler's factory, distributing aid money, and attempting to inform the outside world of their plight.