No contract or other employment arrangement executed or made by and between any school district and teacher shall require by inference or otherwise that said teacher become a member of or belong to any group or organization.
Source: L. 51: p. 761, § 1. CSA: C. 146, § 234(1). CRS 53: § 123-17-13. C.R.S. 1963: § 123-17-5.