We have clearly verifiable reports of John Calvin mercilessly murdering his theological opponents, burning people at the stake for witchcraft & thought crimes, plus mass arrests in Geneva Switzerland. Some reports say 100s of arrests and imprisonments by John Calvin. The report of "Were Witches Really Burned In The Middle Ages" states 500 were condemned as witches and burned at the stake.

Here are some competing views:

"Multiple death sentences are also reported by this same Protestant scholar, Galiffé, who delved into the records of that time. Describing a short period of Calvin’s rule he says, “One counts 30 executions of men and 28 of women, subdivided by method of death: 13 persons hanged, 10 beheaded, 55 quartered, 35 burned alive after being tortured.”(9)Reporting the religious persecutions of Calvin, author Jean Tet aff ...