Mass. Gen. Laws ch. 248, § 32

Whoever, having in his custody or power a person entitled to a writ of habeas corpus, transfers him to the custody, or places him under the power or control, of another person, conceals him or changes the place of his confinement, with intent to evade the service of such writ or to avoid the effect thereof, whether the writ has been issued or not, shall forfeit four hundred dollars to the party aggrieved thereby.