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.