(a) A case shall be held to involve or to grow out of a labor dispute when the case involves persons who are engaged in a single industry, trade, craft or occupation, or have direct or indirect interests therein, or who are employes of the same employer, or who are members of the same or an affiliated organization of employers or employes, whether such dispute is--(1) between one or more employers or associations of employers, and one or more employes or associations of employes; (2) between one or more employers or associations of employers, and one or more employers or associations of employers; or (3) between one or more employes or association of employes, and one or more employes or association of employes; or when the case involves any conflicting or competing interests in a “labor dispute” (as hereinafter defined) of “persons participating or interested” therein (as hereinafter defined).

(b) A person or association shall be held to be a person participating or interested in a labor dispute if relief is sought against him or it, and if he or it is engaged in the same industry, craft or occupation in which such dispute occurs or has a direct or indirect interest therein, or is a member, officer or agent of any association composed in whole, or in part, of employers or employes engaged in such industry, trade, craft or occupation.

(c) The term “labor dispute” includes any controversy concerning terms or conditions of employment, or concerning the association or representation of persons in negotiating, fixing, maintaining, changing, or seeking to arrange terms or conditions of employment or concerning employment relations or any other controversy arising out of the respective interests of employer and employe, regardless of whether or not the disputants stand in the proximate relation of employer and employe, and regardless of whether or not the employes are on strike with the employer.

(d) The term “court” includes every court of common pleas of the several counties of this Commonwealth, including the judge or judges thereof.

(e) The term “complainant” includes every person whether plaintiff or defendant in the cause who seeks affirmative relief.

(f) The term “defendant” includes every person whether plaintiff or defendant in the cause against whom affirmative relief is sought.

(g) The term “employer” is declared to include master, and shall also include natural persons, partnerships, unincorporated associations, joint-stock companies, corporations for profit, corporations not for profit, receivers in equity, and trustees or receivers in bankruptcy.

(h) The term “employe” is declared to include all natural persons who perform services for other persons, and shall not be limited to the employes of a particular employer, and shall include any individual who has ceased work as a consequence of, or in connection with, any matter involved in a labor dispute.

(i) The term “organization” shall mean every unincorporated or incorporated association of employers or employes.

(j) The term “labor organization” shall mean every organization of employes, not dominated or controlled by any employer or any employer organization, having among its purposes that of collective bargaining as to terms and conditions of employment.

(k) The term “employer organization” shall mean every association of, or agency representing, or maintained by, employers, having among its purposes or activities that of studying or advising concerning relations between employers and employes, or bargaining, negotiating or dealing with employes or labor organizations.