Nazi Slave Labor
Question
From what I’ve understood about the Holocaust, there were some Jews whose lives were spared, at least temporarily, in exchange for them working to manufacture various items for the Nazis. What they were manufacturing in some cases were items the Nazis needed in order to murder other Jews. Many Jews ultimately survived the Holocaust this way. Was this work that these Jews did forbidden by Jewish law on the basis that they were contributing to the murder of their fellow Jews?