When was Congress overthrown? Which Congresspeople were harmed? Which Grandmas with American flags, now with criminal records, meant to take over the US government?
Yes, there are a lot of people in prison. They have been subject to norm-breaking prosecution under the opposition party's adminstration. Whenever an opposition party decides to arrest and prosecute its competition, they try to deflect from the authoritarian fact and deride those people as crimimnals as much as possible. This is the playbook for every tin-pot dictator since Sumer.
And in this instance, the authoritarians in question rode into office on eight months of nation-shattering street terrorism that their party incited and protected. Of course, the dictators proclaim those riots as perfectly legitimate and that of their competition as criminal. See: Tin Pot Dictator.