Section 150E:10 - Prohibited practices(a) It shall be a prohibited practice for a public employer or its designated representative to: (1) Interfere, restrain, or coerce any employee in the exercise of any right guaranteed under this chapter;(2) Dominate, interfere, or assist in the formation, existence, or administration of any employee organization;(3) Discriminate in regard to hiring, tenure, or any term or condition of employment to encourage or discourage membership in any employee organization;(4) Discharge or otherwise discriminate against an employee because he has signed or filed an affidavit, petition, or complaint or given any information or testimony under this chapter, or because he has informed, joined, or chosen to be represented by an employee organization;(5) Refuse to bargain collectively in good faith with the exclusive representative as required in section six;(6) Refuse to participate in good faith in the mediation, fact-finding, and arbitration procedures set forth in sections eight and nine;(b) It shall be a prohibited practice for an employee organization or its designated agent to: (1) Interfere, restrain, or coerce any employer or employee in the exercise of any right guaranteed under this chapter;(2) Refuse to bargain collectively in good faith with the public employer, if it is an exclusive representative, as required in section six;(3) Refuse to participate in good faith in the mediation, fact finding and arbitration procedures set forth in sections eight and nine.Mass. Gen. Laws ch. 150E, § 10