No court of this Commonwealth shall issue any restraining order or a temporary or permanent injunction in any case involving or growing out of a labor dispute, except after hearing the testimony of witnesses in open court (with opportunity for cross-examination) in support of the allegations of a complaint made under oath, and testimony in opposition thereto, if offered, and except after findings of fact by the court to the effect--
Such hearing shall be held only after a verified bill of complaint and a verified bill of particulars specifying in detail the time, place, and the nature of the acts complained of, and the names of the persons alleged to have committed the same or participated therein, have been served, and after due and personal notice thereof has been given, in such manner as the court shall direct, to all known persons against whom relief is sought, and also to the chief of those public officials of the county and city, within which the unlawful acts have been threatened or committed, charged with the duty to protect complainant's property. The hearing shall consist of the taking of testimony in open court with opportunity for cross-examination and testimony in opposition thereto, if offered, and no affidavits shall be received in support of any of the allegations of the complaint.
43 P.S. § 206i