You may have read or heard that John Calvin was involved in the execution of man for heresy in the Biblical republic he help found in Geneva, Switzerland. The man was Michael Servetus (1511–1553) and he was executed for heresy. But how culpable was Calvin really?
John Calvin was one of the Reformers and was very zealous to break any influence of the Papacy and the Church of Rome. He believed that the fledgling church could only function when there is good government and that that should be along the lines of God’s principles, the Law. The period in history when this incident occurred was after he had returned to Geneva in 1541.
So that you may decide yourself what is the truth I have excerpted the following from a book “A Glimpse of the Life and Works of John Calvin” by Timothy Tow1 (my emphases added).