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Mar 21, 2023 at 22:12 comment added Robbie Goodwin British law forbids retro-active legislation - although that means in the sense of punishment, not amnesty. Other jurisdictions may have different ideas. Examples dealing with Nazis seem more complicated because they might claim they were acting under legislation then current. I suspect the Courts would say - in fact, did say - that proclamations issued by an illegitimate invader had no effect on legislation, but merely provided false excuses for a bunch of war criminals.
Mar 20, 2023 at 9:11 comment added mcalex Australia? Absolutely.
Mar 20, 2023 at 5:20 comment added vsz @MarkRogers Those were special circumstances. Foreign powers won a war, vanquished their opponents, and were in complete control over the country, being able to do whatever they wanted. It was a completely different government which prosecuted these cases, than the one under which the accused did the things they were under trial for. On the other hand, the assumption behind the question is that the jurisdiction stays the same, and the only difference is that a new law is passed which makes something no longer legal (instead of the suspects being tried by a completely different government).
S Mar 20, 2023 at 1:53 history suggested Vikki
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Mar 19, 2023 at 20:41 comment added Luke Sawczak @MarkRogers A good example is Aktion T4. Based on euthanasia science which was "respectable" (as Wikipedia puts it) before the war and a program that was expanded to mass murder levels by Hitler's direct authorization, prosecuted as a crime against humanity only after the war.
Mar 19, 2023 at 15:26 comment added user1937198 Whilst not used in recent times, it is still likely constitutional in england to pass bills of attainder en.wikipedia.org/wiki/Bill_of_attainder, which declare that a specific act is illegal after the fact.
Mar 19, 2023 at 0:33 answer added gnasher729 timeline score: 2
Mar 18, 2023 at 19:47 comment added Clockwork @MarkRogers en.wikipedia.org/wiki/Crimes_against_humanity
Mar 18, 2023 at 19:20 vote accept user1867437
Mar 18, 2023 at 18:06 comment added Richard @MarkRogers - en.wikipedia.org/wiki/Ex_post_facto_law
Mar 18, 2023 at 17:40 comment added Mark Rogers The nazi war crimes come to mind, I'm not sure they were strictly illegal at the time.
Mar 18, 2023 at 14:41 answer added Clockwork timeline score: 3
Mar 18, 2023 at 9:53 answer added Peter - Reinstate Monica timeline score: 24
Mar 18, 2023 at 9:34 answer added Wrzlprmft timeline score: 18
Mar 18, 2023 at 3:18 review Suggested edits
S Mar 20, 2023 at 1:53
Mar 18, 2023 at 0:42 history became hot network question
Mar 17, 2023 at 22:02 answer added Jen timeline score: 12
Mar 17, 2023 at 17:31 answer added jwh20 timeline score: 29
S Mar 17, 2023 at 16:41 review First questions
Mar 17, 2023 at 17:28
S Mar 17, 2023 at 16:41 history asked user1867437 CC BY-SA 4.0