1. (1) The following is 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 thereof, either party thereto to act in disregard of the undertaking or promise: Every undertaking or promise made on or after April 1, 1943, whether written or oral, express or implied, between any employee or prospective employee and his employer, prospective employer, or any other individual, firm, company, association, or corporation, whereby:

   1. (a) Either party thereto undertakes or promises to join or to remain a member of some specific labor organization or to join or remain a member of some specific employer organization or any employer organization; or
   2. (b) Either party thereto undertakes or promises not to join or not to remain a member of some specific labor organization or of some specific employer organization or any employer organizations; or
   3. (c) Either party thereto undertakes or promises that he will withdraw from an employment relation in the event that he joins or remains a member of some specific labor organization or any labor organization or of some specific employer organization or any employer organization.

Source: L. 43: p. 412, § 17. CSA: C. 97, § 94(17). CRS 53: § 80-5-17. C.R.S. 1963: § 80-4-17.