More notorious even than the political dissensions were the moral and theological disputes which almost disrupted the colony. The magistrates and elders did not compel men to leave the colony because of political heresy, but they did drive them out because of difference in matters of theology. Even before the company came over, Endecott had sent John and Samuel Browne back to England because they worshiped according to the Book of Common Prayer. Morton and six others were banished in 1630 as an immoral influence. Sir Christopher Gardiner, Philip Ratcliffe, Richard Wright, the Walfords, and Henry Lynn were all forced to leave in 1630 and 1631 as "unmeete to inhabit here." Roger Williams, the tolerationist and upholder of soul-liberty, who complained of the magistrates for oppression and of the elders for injustice and who opposed the close union of church and state, was compelled to leave during the winter of 1635 and 1636. But the great expulsion came in 1637, when an epidemic of heresy struck the colony. A synod at Newtown condemned eighty erroneous opinions, and the general court then disarmed or banished all who persisted in error.
A furor of excitement gathered about Anne Hutchinson, who claimed to be moved by the spirit and denied that an outward conformity to the letter of the covenant was a sufficient test of true religion unless accompanied with a change in the inner life. She was a nonconformist among those who, refusing to conform to the Church of England, had now themselves become conformists of the strictest type. To Mrs. Hutchinson the "vexatious legalism of Puritanism" was as abhorrent as had been the practices of the Roman and Anglican churches to the Puritans, and, though the latter did not realize it, they were as unjust to her as Laud had been to them. She broke from a covenant of works in favor of a covenant of grace and in so doing defied the standing authorities and the ruling clergy of the colony. Her wit, undeniable power of exhortation, philanthropic disposition, and personal attributes which gave her an ascendency in the Boston church, drew to her a large following and placed the supremacy of the orthodox party in peril. After a long and wordy struggle to check the "misgovernment of a woman's tongue" and to rebuke "the impudent boldness of a proud dame," Mrs. Hutchinson was excommunicated and banished; and certain of those who upheld her--Wheelwright, Coggeshall, Aspinwall, Coddington, and Underhill, all leading men of the colony--were also forced to leave. In Boston and the adjoining towns dozens of men were disarmed for fear of a general uprising against the orthodox government.