Reformer

n.	1.	One who effects a reformation or amendment; one who labors for, or urges, reform; as, a reformer of manners, or of abuses.
	2.	(Eccl.Hist.) One of those who commenced the reformation of religion in the sixteenth century, as Luther, Melanchthon, Zwingli, and Calvin.

Noun	1.	reformer - a disputant who advocates reform Synonyms: crusader, meliorist, reformist
	2.	reformer - an apparatus that reforms the molecular structure of hydrocarbons to produce richer fuel; "a catalytic reformer"

Fabian, Tammany man, extremist, machine politician, meliorist, old campaigner, party boss, party chieftain, party leader, pol, political hack, political leader, politician, professional politician, progressionist, progressist, progressive, progressivist, radical, reform politician, reformist, revisionist, revolutionary, utopian, utopist, war-horse, wheelhorse