We did that after W.W. II we starved and killed about 5 million Germans.
The Rheinwiesenlager.
https://www.warhistoryonline.com/instant-articles/was-it-a-war-crime-thousands-of-germans-died-in-american-pow-camps-in1945-m.html
Completely acceptable though because they were not Human Beings and we know two wrongs always make a right and of course they deserved it...