tsalarioth

My bad, it was not government agency, it was some Protestant church-related organization:

https://idzpodprad.pl/aktualnosci/ipp-club-made-amazing-discovery-hampstead-cemetary/

Have you heard of August Agbola O'Browne (https://en.wikipedia.org/wiki/August_Agbola_O%27Browne)???

A black guy working in/for Polish underground during German occupation.

Not necessary a straight Nazi Germany related, but nevertheless interesting case from German-occupied Poland.

A few years ago his story was re-discovered here, in Poland. I think that some government agency restored his grave in London