I believe that all of these situations could quite easily happen here in the USA in the near future.
Any type of outside established government political opposition that gained traction here would be met with I think worse than imprisonment, more like murder. We only have two recognized parties here, in other words, other political parties are not taken seriously for they wield no major power in Washington, DC or with the majority of citizens…should that change and other real challengers took root here in the USA which has never happened before, those opposition leaders would either be falsely imprisoned, disappear, or be found dead. And there haven’t been any anti-government protests here since Vietnam where…
Resistance to the established political machine shot dead.
These were protests to stop war, rather than to unseat the established government, people were still killed by military and over 12,000 were arrested. If there were major protests against the government itself, it’d turn ugly real fast and martial law would be declared.