I've been reading old primary source texts from colonial America which speak to this issue. One interesting one is the following:
The Laws and Liberties of Massachusetts, 1647
Regarding Heresy:
"Although no humane power be Lord over the Faith and Consciences of men, and therefore may not constrain them to believe or profess against their consciences: yet because such as bring in damnable heresies, tending to the subversion of the Christian Faith, and destruction of the souls of men, ought duly to be restrained from such notorious impiety, it is therefore ordered and decreed by this Court;
That if any Christian within this Jurisdiction shall go about to subvert and destroy the Christian Faith and Religion, by broaching or maintaining any damnable heresy; as denying the immortality of the soul, or the resurrection of the body, or any sin to be repented of in the regenerate, or any evil done by the outward man to be accounted in: or denying that Christ gave himself a Ransom for our sins or shall affirm that we are not justified by his Death and Righteousness, but by the perfection of our own works; or shall deny the morality of the fourth commandment, or shall endeavor to seduce others to any heresies aforementioned, every such person continuing obstinate therein after due means of conviction shall be sentenced to banishment."
http://plaza.ufl.edu/edale/Laws and Liberties.htm