731.4  Union dues as prerequisite to employment — prohibited.
  It shall be unlawful for any person, firm, association, labor organization or corporation, or political subdivision, either directly or indirectly, or in any manner or by any means as a prerequisite to or a condition of employment to require any person to pay dues, charges, fees, contributions, fines or assessments to any labor union, labor association or labor organization.
[C50, 54, 58, 62, 66, 71, 73, 75, 77, §736A.4; C79, 81, §731.4]