No restraining order or injunctive relief shall be granted to any complainant involved in the labor dispute in question who has failed to comply with any obligation imposed by law, or who has failed to make every reasonable effort to settle that dispute either by negotiation or with the aid of any available governmental machinery of mediation or voluntary arbitration.
Source:
Section 1138.2, https://leginfo.legislature.ca.gov/faces/codes_displaySection.xhtml?lawCode=LAB§ionNum=1138.2..