Mass. Gen. Laws ch. 94 § 51
Whoever sells, exposes for sale or has in his possession with intent to sell, any article, substance or compound made in imitation or semblance of butter or cheese or as a substitute therefor, except as provided in the two preceding sections, and whoever with intent to deceive defaces, erases, cancels or removes any mark, stamp, brand, label or wrapper provided for in said sections, or in any manner falsely labels, stamps or marks any box, tub, article or package marked, stamped or labelled as provided in said sections, or whoever himself or by his agent sells, exposes for sale, or has in his possession with intent to sell, oleomargarine, contained in any box, tub, article or package, marked or labelled with the word "dairy", or the word "creamery", or the name of any breed of dairy cattle, or whoever uses in any way in connection or association with an advertisement of margarine, oleomargarine or of any substance designed to be used as a substitute for butter, the name or representation of any dairy animal or breed of dairy cattle, or, with intent to deceive, uses in any way in such connection or association the word "butter", "creamery" or "dairy", or any other words or symbols commonly used only in advertisements of butter, shall for the first offence forfeit one hundred dollars, and for each subsequent offence two hundred dollars, to the use of the town where the offence was committed.
Mass. Gen. Laws ch. 94, § 51