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(1) an undertaking or promise by either party to join or to remain a member of some specific labor organization or organizations or to join or remain a member of some specific employer organization or any employer organization or organizations;
(2) an undertaking or promise by either party to not join or not remain a member of some specific labor organization or any labor organization or organizations, or of some specific employer organization or any employer organization or organizations; or
(3) an undertaking or promise by either party to withdraw from an employment relation in the event that the party joins or remains a member of some specific labor organization or any labor organization or organizations, or of some specific employer organization or any employer organization or organizations.