Idaho Statutes Title 44. Labor § 44-702. Contracts between individual employee and employer for or against union membership barred

(a) Either party thereto undertakes or promises to join or to remain a member of some specific labor organization or organizations or to join or to remain a member of some specific employer organization or any employer organization or organizations; and or

(b) Either party thereto undertakes or promises not to join or not to 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 and or

(c) Either party thereto undertakes or promises that he will withdraw from any employment relation in the event that he 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,

Is hereby declared to be contrary to public policy and shall not afford any basis for the granting of legal or equitable relief by any court against a party to such undertaking or promise, or against any other persons who may advise, urge or induce, without fraud, violence, or threat therefor, either party thereto to act in disregard of such undertaking or promise.