Concentration camp inmates on liberation by the Red Army in 1944. They were not put there by Nazis - no, they were put there by the Finnish government, which had its own set of camps. The children in the photo were imprisoned due to their ethnicity - Russian.
https://www.histclo.com/imagef/date/2015/01/kar-cc44s.jpg
https://catflag.wordpress.com/2018/06/10/finland-in-wwii-the-democratic-axis-power/
https://en.wikipedia.org/wiki/War-responsibility_trials_in_Finland
https://en.wikipedia.org/wiki/East_Karelian_concentration_camps