Massachusetts General Laws Part IV. Crimes, Punishments and Proceedings in Criminal Cases (Ch. 263-280) Ch. 271, § 38

Every person shall furnish, upon demand, to any customer or principal for whom such person has executed any order for the actual purchase or sale of any securities or commodities, either for immediate or future delivery, a written statement containing the names of the persons from whom such property was bought, or to whom it has been sold, as the fact may be, the time when, place where and the price at which the same was either bought or sold; and if such person refuses or neglects to furnish such statement within twenty-four hours after such demand, such refusal or neglect shall be prima facie evidence that such purchase or sale was bucketing or bucket-shopping.