Mass. Gen. Laws ch. 101 § 2
The provisions of this chapter relative to transient vendors shall not apply to sales by commercial travelers or by selling agents to dealers in the usual course of business, or to bona fide sales of goods, wares or merchandise by sample for future delivery, or to sales of goods, wares or merchandise by any domestic corporation or agent thereof, by any person, whether principal or agent, who engages in temporary or transient business in any town in which taxes have been assessed upon his stock in trade during the current year, or to hawkers and pedlers as defined in section thirteen, nor shall they affect the right of any town to pass ordinances or by-laws authorized by law relative to transient vendors. No transient vendor shall be relieved or exempted from the provisions and requirements of this chapter relative to transient vendors by reason of associating himself temporarily with any local dealer, trader or merchant, or by conducting such temporary or transient business in connection with or as a part of the business of, or in the name of any local dealer, trader or merchant.
Mass. Gen. Laws ch. 101, § 2