Jacobin

Jacobin,
originally a name of the French friars of the order of St Dominic, so called because the church of Saint-Jacques in Paris was given to them and they built their first convent near it. From them the name was transferred to the members of a political club established in 1789 , in Paris, in the old convent of the Jacobins, to maintain extreme democratic and egalitarian principles. It was applied in a transferred sense to sympathizers with their principles, and about 1800 became a nickname for any radical political reformer.