Szmalcownik
Szmalcownik (Polish pronunciation: [ʂmalˈtsɔvɲik]); in English, also sometimes spelled shmaltsovnik) is a pejorative Polish slang expression that originated during the Holocaust in Poland in World War II and refers to a person who blackmailed Jews who were in hiding, or who blackmailed Poles who aided Jews, during the German occupation. By stripping Jews of their financial resources, blackmailers added substantially to the danger that Jews and their rescuers faced and increased their chances of being caught and killed.