(a) Involving a labor dispute, as defined herein, which is in disregard, breach, or violation of, or which tends to procure the disregard, breach, or violation of, a valid subsisting labor agreement arrived at between an employer and the representatives designated or selected by the employes for the purpose of collective bargaining, as defined and provided for in the act, approved the first day of June, one thousand nine hundred and thirty-seven (Pamphlet Laws, one thousand one hundred sixty-eight), entitled “An act to protect the rights of employes to organize and bargain collectively; creating the Pennsylvania Labor Relations Board; conferring powers and imposing duties upon the Pennsylvania Labor Relations Board, officers of the State government, and courts; providing for the right of employes to organize and bargain collectively; declaring certain labor practices by employers to be unfair; further providing that representatives of a majority of the employes be the exclusive representatives of all the employes; authorizing the board to conduct hearings and elections, and certify as to representatives of employes for purposes of collective bargaining; empowering the board to prevent any person from engaging in any unfair labor practice, and providing a procedure for such cases, including the issuance of a complaint, the conducting of a hearing, and the making of an order; empowering the board to petition a court of common pleas for the enforcement of its order, and providing a procedure for such cases; providing for the review of an order of the board by a court of common pleas on petition of any person aggrieved by such order, and establishing a procedure for such cases; providing for an appeal from the common pleas court to the Supreme Court; providing the board with investigatory powers, including the power to issue subpoenas and the compelling of obedience to them through application to the proper court; providing for service of papers and process of the board; prescribing certain penalties,” and amendments thereto,¹ or as defined and provided for in the National Labor Relations Act, approved the fifth day of July, one thousand nine hundred and thirty-five:² Provided, however, That the complaining person has not, during the term of the said agreement, committed an act as defined in both of the aforesaid acts as an unfair labor practice or violated any of the terms of said agreement.

(b) Where a majority of the employes have not joined a labor organization, or where two or more labor organizations are competing for membership of the employes, and any labor organization or any of its officers, agents, representatives, employes, or members engages in a course of conduct intended or calculated to coerce an employer to compel or require his employes to prefer or become members of or otherwise join any labor organization.

(c) Where any person, association, employe, labor organization, or any employe, agent, representative, or officer of a labor organization engages in a course of conduct intended or calculated to coerce an employer to commit a violation of the Pennsylvania Labor Relations Act of 1937 or the National Labor Relations Act of 1935.

(d) Where in the course of a labor dispute as herein defined, an employe, or employes acting in concert, or a labor organization, or the members, officers, agents, or representatives of a labor organization or anyone acting for such organization, seize, hold, damage, or destroy the plant, equipment, machinery, or other property of the employer with the intention of compelling the employer to accede to any demands, conditions, or terms of employment, or for collective bargaining.