Section 552.1 Of Article 1. Trespassing Or Loitering Near Posted Industrial Property From California Penal Code >> Title 13. >> Part 1. >> Chapter 12. >> Article 1.
552.1
. This article does not prohibit:
(a) Any lawful activity for the purpose of engaging in any
organizational effort on behalf of any labor union, agent, or member
thereof, or of any employee group, or any member thereof, employed or
formerly employed in any place of business or manufacturing
establishment described in this article, or for the purpose of
carrying on the lawful activities of labor unions, or members
thereof.
(b) Any lawful activity for the purpose of investigation of the
safety of working conditions on posted property by a representative
of a labor union or other employee group who has upon his person
written evidence of due authorization by his labor union or employee
group to make such investigation.