(a) Any use of force or violence, disturbing the public peace,
or any threat to use force or violence, if accompanied by immediate
power of execution, by two or more persons acting together, and
without authority of law, is a riot.
(b) As used in this section, disturbing the public peace may occur
in any place of confinement. Place of confinement means any state
prison, county jail, industrial farm, or road camp, or any city jail,
industrial farm, or road camp, or any juvenile hall, juvenile camp,
juvenile ranch, or juvenile forestry camp.