So I guess the exact analogy would be the Inquisitions.
Or “star-chamber” courts in England.
Inquisitions rather than massacres. Which would you have? The Albi in southern France were the equivalent of the Mormons in the United States, except far more radical. The pope sent in crusaders to put them down. The Inquisitions were courts set up to regularize the repression. Of course,suppression has bad, bad long term consequences. The Huguenot had their greatest support in the same region; the Jacobins their greatest strength outside of Paris. No bad deed goes unpunished. In Spain, after the Reconquista had recovered Spain from the Moors, the Jews and Moors remaining were forced to convert, mostly in the same way that Christians and Jews were in Muslim lands, or Protestants in Catholic lands or Catholics in Protestant countries, by economic and social disadvantages. The Inquistion was a result of the final unification of Spain. I suggest you read Henry Kamen’s book on the Inquisition.