(a) Offense defined.--A person is guilty of criminal coercion, if, with intent unlawfully to restrict freedom of action of another to the detriment of the other, he threatens to:

(b) Defense.--It is a defense to prosecution based on paragraphs (a)(2), (a)(3) or (a)(4) of this section that the actor believed the accusation or secret to be true or the proposed official action justified and that his intent was limited to compelling the other to behave in a way reasonably related to the circumstances which were the subject of the accusation, exposure or proposed official action, as by desisting from further misbehavior, making good a wrong done, refraining from taking any action or responsibility for which the actor believes the other disqualified.

(c) Grading.--Criminal coercion is a misdemeanor of the second degree unless the threat is to commit a felony or the intent of the actor is felonious, in which cases the offense is a misdemeanor of the first degree.