That depends on how democratic the nation is. Democracies and republics have more power in the hands of citizens, who don’t want their government to abuse it. They tend to have constitutions which forbids this specifically, because it’s too easy a tool to abuse. No one complains at first when you come after the child molesters, then once people are used to the idea of retroactive laws you start abusing it on everyone else.
In nations where the democratic process or the constitution is weaker, or even inexistent, the law is whatever the leaders say it is, and that’s the end of that. those unhappy become undesirables, when they don’t just disappear.
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