Because of a long history of protests turning violent, $($and prior to the events in this hypo$)$ the City of Baton Rouge, pursuant to its police powers, had passed an ordinance that banned firearm possession any time two or more people gathered in the same place. Otherwise, though Louisiana bans the purchase of firearms through the mail, it remains an open carry state, where residents are free to carry firearms in public without having to obtain a license or permit.

Marcus is in the habit of wearing a $\mathrm{.}38$ in a holster on his side every time he leaves the house. When the protest passes by outside, he jumps up to join it$,$ strapping his gun to his side on the way out the door. Though he never engages in looting or violence, later in the day he is arrested for violating the city's ordinance.

Question: Is this ordinance legal? This are multiple correct answers here. Choose all that apply.