No restraining order or temporary or permanent injunction shall be granted in a case involving or growing out of a labor dispute, except on the basis of findings of fact made and filed by the court in the record of the case prior to the issuance of the restraining order or injunction; and every restraining order or injunction granted in a case involving or growing out of a labor dispute shall include only a prohibition of the specific act or acts as may be expressly complained of in the complaint or petition filed in such case and as shall be expressly included in findings of fact made and filed by the court.