731.2  Refusal to employ prohibited.
  It shall be unlawful for any person, firm, association or corporation to refuse or deny employment to any person because of membership in, or affiliation with, or resignation or withdrawal from, a labor union, organization or association, or because of refusal to join or affiliate with a labor union, organization or association.
[C50, 54, 58, 62, 66, 71, 73, 75, 77, §736A.2; C79, 81, §731.2]