"Rebellion, uprising, or insurrection is a refusal of obedience or order." is the first sentence of the Wikipedia page for Rebellion.

Irrespective of the primary intent of the civil unrest [1], failing to disperse after being ordered to is an act of insurrection. I express no opinion as to whether insurrection is called for or not, just that technically it seems to be such.

[1] some people say 'protests', others say 'riots', I'm hoping 'civil unrest' is neutral but I'd happily take correction if it is not.