Labor Unions. Colorado Recent Colorado Supreme Court ruling divides suburbs on public union talks. Post S 3, 1976 p.17 Union-company security contract clauses are invalid rules Colorado Supreme Court. Post Ja 27, 1977 p.33 Agreements in Colorado require some workers to pay union dues whether they belong to union or not; court rules agreements invalid. RMN F 7, 1977 p.6 Labor unions seeking legislation to amend the Colorado Labor Peace Act to forestall thousands of union elec- tions. Details. RMN F 21, 1977 p.6,4o-41