This was done by the Franco dictatorship after the civil war of 1936-9. Children of Republican families were forcibly removed and handed over for adoption to regime-friendly families for reeducation. Many of the children were so small that they had no memory of their real parents. This only started coming to light in 2002 and onwards. Some of these children managed to locate their already very elderly parents. Many were too late and only found graves of their moms and dads. I did some research on this a while ago, and it’s heartbreaking.
In the 1970s, this strategy was adopted by the military junta in Argentina. Children were handed over to the literal rapists and torturers of their parents. Some grew up calling their mom’s rapist “dad.” Imagine what they felt when this all started to be revealed. DNA was very helpful in reuniting families.
Russians are in great company here. Franco, the junta. Unsurprisingly, Franco was a great admirer of Hitler and the Argentinian junta engaged former Nazis hiding in Argentina in teaching torture techniques to the junta butchers.