It would seem that calling into question either the narrative or established authority is grounds for being labeled as an extremist or terrorist.
According to the FBI website, their definition of TERRORIST is:
Protecting the United States from terrorist attacks is the FBI’s number one priority. The Bureau works closely with its partners to neutralize terrorist cells and operatives here in the United States, help dismantle extremist networks worldwide, and to cut off financing and other forms of support provided to foreign terrorist organizations.
- a person who holds extreme or fanatical political or religious views, especially one who resorts to or advocates extreme action. political extremists