California Code, Government Code - GOV § 3612

(a) Whenever in the opinion of the Governor, a threatened or actual strike or lockout will, if permitted to occur or continue, significantly disrupt public transportation services and endanger the public's health, safety, or welfare, and upon the request of either party to the dispute, the Governor may appoint a board to investigate the issues involved in the dispute and to make a written report to him or her within seven days. The report shall include a statement of the facts with respect to the dispute, including the respective positions of the parties, but shall not contain recommendations. The report shall be made available to the public.

(b) Any strike or lockout during the period of investigation of the board appointed pursuant to this section is prohibited.