California Code, Penal Code - PEN § 601

(a) Any person is guilty of trespass who makes a credible threat to cause serious bodily injury, as defined in subdivision (a) of Section 417.6, to another person with the intent to place that other person in reasonable fear for his or her safety, or the safety of his or her immediate family, as defined in subdivision (l) of Section 646.9, and who does any of the following:

(b) Subdivision (a) shall not apply if the residence, real property, or workplace described in paragraph (1) or (2) that is entered is the residence, real property, or workplace of the person making the threat.

(c) This section shall not apply to any person who is engaged in labor union activities which are permitted to be carried out on the property by the California Agricultural Labor Relations Act, Part 3.5 (commencing with Section 1140) of Division 2 of the Labor Code, or by the National Labor Relations Act.

(d) A violation of this section shall be punishable by imprisonment pursuant to subdivision (h) of Section 1170, or by imprisonment in a county jail not exceeding one year, or by a fine not exceeding two thousand dollars ($2,000), or by both that fine and imprisonment.