It is an unfair labor practice for a labor organization or its agents to: (1) restrain or coerce: (a) employees in the exercise of the right guaranteed in 39-31-201; or (b) a public employer in the selection of a representative for the purpose of collective bargaining or the adjustment of grievances; (2) refuse to bargain collectively in good faith with a public employer if it has been designated as the exclusive representative of employees; (3) use agency shop fees for contributions to political candidates or parties at state or local levels.