2009 California Penal Code - Section 12590 :: Article 5. Picketing

12590.  (a) Any person who does any of the following acts while
engaged in picketing, or other informational activities in a public
place relating to a concerted refusal to work, is guilty of a
misdemeanor:
   (1) Carries concealed upon his person or within any vehicle which
is under his or her control or direction any pistol, revolver, or
other firearm capable of being concealed upon the person.
   (2) Carries a loaded firearm upon his or her person or within any
vehicle which is under his or her control or direction.
   (3) Carries a deadly weapon.
   (4) Wears the uniform of a peace officer, whether or not the
person is a peace officer.
   (b) This section shall not be construed to authorize or ratify any
picketing or other informational activities not otherwise authorized
by law.
   (c) Section 12027 shall not be construed to authorize any conduct
described in paragraph (1) of subdivision (a), nor shall subdivision
(b) of Section 12031 be construed to authorize any conduct described
in paragraph (2) of subdivision (a).