Section 7. No court of this Commonwealth shall have jurisdiction or power in any case involving, or growing out of, a labor dispute to issue a restraining order or temporary or permanent injunction--
(a) Upon the ground that any of the persons participating or interested in the labor dispute constitute or are engaged in an unlawful combination or conspiracy because of the doing in concert of the acts enumerated in section six of this act; or
(b) Forbidding any of the acts enumerated in section six upon the ground that illegal acts have been committed or threatened in the course of any labor dispute, or that any ends sought to be accomplished by any party to the labor dispute are illegal.