Oregon Revised Statutes Labor and Employment; Unlawful Discrimination § 663.130

(1) To cause or attempt to cause an employer to discriminate against an employee in violation of ORS 663.125 or to discriminate against an employee with respect to whom membership in such organization has been denied or terminated on some ground other than the failure of the employee to tender the periodic dues and the initiation fees uniformly required as a condition of acquiring or retaining membership;

(2) To refuse to bargain collectively with an employer, if it is the elected and certified representative of the employees;

(3) To cause or attempt to cause an employer to pay or deliver, or agree to pay or deliver, any money or other thing of value, in the nature of an exaction, for services which are not performed or not to be performed; or

(4) To restrain or coerce: