Massachusetts
GL ch. 265 § 43A. Criminal Harassment.

(a) Whoever willfully and maliciously engages in a knowing pattern of conduct or series of acts over a period of time directed at a specific person, which seriously alarms that person and would cause a reasonable person to suffer substantial emotional distress, shall be guilty of the crime of criminal harassment and shall be punished by imprisonment in a house of correction for not more than two and one-half years or by a fine of not more than $1,000, or by both such fine and imprisonment. The conduct or acts described in this paragraph shall include, but not be limited to, conduct or acts conducted by mail or by use of a telephonic or telecommunication device or electronic communication device including, but not limited to, any device that transfers signs, signals, writing, images, sounds, data or intelligence of any nature transmitted in whole or in part by a wire, radio, electromagnetic, photo-electronic or photo-optical system, including, but not limited to, electronic mail, internet communications, instant messages or facsimile communications.
(b) Whoever, after having been convicted of the crime of criminal harassment, commits a second or subsequent such crime, or whoever commits the crime of criminal harassment having previously been convicted of a violation of section 43, shall be punished by imprisonment in a house of correction for not more than two and one-half years or by imprisonment in the state prison for not more than ten years.

Model Penal Code: Section 250.4 (Harassment) provides as follows:
A person commits a petty misdemeanor if, with purpose to harass another, he:
(1) makes a telephone call without purpose of legitimate communication; or
(2) insults, taunts, or challenges another in a manner likely to provoke violent or disorderly response; or
(3) makes repeated communications anonymously or at extremely inconvenient hours, or in offensively coarse language; or
(4) subjects another to an offensive touching; or
(5) engages in any other course of alarming conduct serving no legitimate purpose of the actor.