Many people do not even realize what their rights are, as guarenteed by the U.S. Consititution. For this reason, I have included the complete text of the Bill of Rights. No one should ever take away your constitutional rights. If they try to do so, and use force, then there is even a specific Massachusetts State law you can use in your defence:
GENERAL LAWS OF MASSACHUSETTS
Chapter 265: Section 37. Violations of constitutional rights; punishment.
Section 37. No person, whether or not acting under color of law, shall by force or threat of force, willfully injure, intimidate or interfere with, or attempt to injure, intimidate or interfere with, or oppress or threaten any other person in the free exercise or enjoyment of any right or privilege secured to him by the constitution or laws of the commonwealth or by the constitution or laws of the United States. Any person convicted of violating this provision shall be fined not more than one thousand dollars or imprisoned not more than one year or both; and if bodily injury results, shall be punished by a fine of not more than ten thousand dollars or by imprisonment for not more than ten years, or both.
And here is a link to my favorite page dealing with Defending the Bill of Rights