Kidnapping of children by Nazi Germany
During World War II, around 200,000 ethnic Polish children as well as an unknown number of children of other Slavic ethnicities from the Soviet Union were abducted from their homes and forcibly transported to Nazi Germany for purposes of forced labour, medical experimentation, or Germanization. This was among the most notable Nazi crimes against children.
Source: Wikipedia — Kidnapping of children by Nazi Germany (CC BY-SA 4.0)