Can you provide examples of the CIA making average Americans disappear for criticizing the government?
Plenty, if the definition of criticize is to join an organization allegedly preparing to oppose the government with force. Which is a commonly used definition in history and, alas, in the current situation as well.
No. That it is not all what criticize
is a form of speech, period. To use force, or to prepare to use force, in addition to openly expressing criticism, is to do more than merely criticize. In the US, criticism of the government is Constitutionally protected; using force to oppose it is not. You've got a conflation, there.