It is an unfair labor practice for a bargaining representative to:

(1) Interfere with, restrain, or coerce employees in the exercise of their rights guaranteed by this chapter;

(2) Induce the employer to commit an unfair labor practice;

(3) Discriminate against an employee who has filed an unfair labor practice charge or who has given testimony under this chapter; or

(4) Refuse to engage in collective bargaining.