Mass. Gen. Laws ch. 171 § 30
Every member of a credit union shall hold 1 share and may hold shares or make deposits, or both, therein, in his own name and he may jointly, with one or more persons, hold shares or make deposits, or both. An organizational member may purchase shares or make deposits; provided, however, that the total of the payments by all organizational members shall not exceed, at any time, 25 per cent of the assets of the credit union.
This section shall apply to members of credit unions which are insured by the National Credit Union Administration and to members of low-income credit unions; provided, however, that no such credit union shall accept deposits or payments for shares for the account of a shareholder or depositor in excess of the amount which is insured by the National Credit Union Administration unless the excess is insured by the Massachusetts Credit Union Share Insurance Corporation pursuant to section 6D of chapter 294 of the acts of 1961.
Mass. Gen. Laws ch. 171, § 30