Cal. Codes » Penal Code / PART 1. OF CRIMES AND PUNISHMENTS / TITLE 13. OF CRIMES AGAINST PROPERTY / CHAPTER 12. Unlawful Interference With Property / ARTICLE 1. Trespassing or Loitering Near Posted Industrial Property
California Codes

Cal. Penal Code § 552.1 (2026)

Trespassing or Loitering Near Posted Industrial Property

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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.

Notes of Decisions
Cited in 6 cases, 1961–1981 · leading case: Agric. Labor Relations Bd. v. Superior Court, 546 P.2d 687 (Cal. 1976).
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Agric. Labor Relations Bd. v. Superior Court, 546 P.2d 687 (Cal. 1976). · cites it 2× “Thus each statute is on par with the other, and the Penal Code provision being a legislative enactment, it must take precedence over the administrative regulation based on a power implied from the labor statute. Moreover, if either the act or the Penal Code provisions must be…”
In re Catalano, 623 P.2d 228 (Cal. 1981). “(Pen. Code, § 552.1.) Thus recently we reversed the conviction of a labor union official for picketing on the property of a nonparticipant in the labor dispute.”
Cotton v. Superior Court, 364 P.2d 241 (Cal. 1961). “Code, §602, subdivision (1)) is overridden by Penal Code section 552.1, subdivision (a), which permits trespass in an attempt to organize a labor union.”
Schwartz-Torrance Inv. Corp. v. Bakery & Confectionery Workers' Union, 394 P.2d 921 (Cal. 1964). “Construing section 552.1, which excepts from the criminal trespass statute any “lawful activity for the purpose of engaging in any organizational effort on behalf of any labor union .”
United Farm Workers Etc. Comm. v. Superior Court, 254 Cal. App. 2d 768 (Cal. Ct. App. 1967). “(Pen.Code, § 552.1.) Tims recently wTe reversed the conviction of a labor union official for picketing on the property of a nonparticipant, in the labor dispute.”
Schwartz-Torrance Inv. v. Bakery & Confectionery Wrks. Un., 394 P.2d 921 (Cal. 1964). “(Pen. Code, § 552.1.) Thus recently we reversed the conviction of a labor union official for picketing on the property of a nonparticipant in the labor dispute.”
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