ORS 662.070: Liability of associations and officers and members of associations for unlawful acts of individuals.

No officer or member of any association or organization, and no association or organization participating or interested in a labor dispute, shall be held responsible or liable in any court of this state for the unlawful acts of individual officers, members or agents, except upon clear proof of actual participation in, or actual authorization of, such acts, or of ratification of such acts after actual knowledge thereof.