It is an unfair labor practice for a bargaining representative:

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

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

(3) To discriminate against a symphony musician who has filed an unfair labor practice charge or who has given testimony under this chapter;

(4) To refuse to engage in collective bargaining.