Lockdown is Domestic Terrorism by Definition - Federal Crime

18 U.S. Code § 2331.Definitions

(5)  the term “domestic terrorism” means activities that--

(A)  involve acts dangerous to human life that are a violation of the criminal laws of the United States or of any State;

(B)  appear to be intended--

(i)  to intimidate or coerce a civilian population;

(ii)  to influence the policy of a government by intimidation or coercion;  or

(iii)  to affect the conduct of a government by mass destruction, assassination, or kidnapping;  and

(C)  occur primarily within the territorial jurisdiction of the United States.