Massachusetts General Laws Part I. Administration of the Government (Ch. 1-182) Ch. 147, § 36A

(a) The commission shall set forth rules and regulations for contracts between a manager and an unarmed combatant and contracts between a promoter and an unarmed combatant. An unarmed combatant shall not enter a contract with a manager or a promoter unless the contract is filed with the commission prior to a scheduled contest in an amount of time established by the commission. The commission shall only honor a contract that is executed and notarized on a form provided by the commission unless the contract terms comply with the requirements set forth by the commission.

(b) The commission may invalidate, enforce, mediate or modify contracts pursuant to subsection (a). The commission may require that each contract include language authorizing the commission to withhold any portion of a promoter's or manager's share of a purse in the event of a contractual dispute with a contestant over their entitlement to any portion of a purse.

(c) The commission shall be the sole arbiter of a breach of contract and shall establish rules governing the manner in which contract disputes shall be resolved.