Or. Rev. Stat. § 663.170 – Unfair labor practice provisions not retroactive

(1) No provision of this chapter makes an unfair labor practice any act that was performed before January 1, 1972.
(2) ORS 663.125 and 663.130 (1) do not make an unfair labor practice the performance of any obligation under a collective-bargaining agreement entered into before January 1, 1972, unless the agreement was renewed or extended after January 1, 1972.

[1971 c.729 §18]