mutineer - open rebellion and refusal to obey authorities (especially by seamen or soldiers)

crusader, meliorist, reformer, reformist - a disputant who advocates reform

revolutionary, revolutionist, subversive, subverter - a radical supporter of political or social revolution

Young Turk - a member of one or more of the insurgetn groups in Turkey in the late 19th century who rebelled against the absolutism of Ottoman rule

Nat Turner, Turner - United States slave and insurrectionist who in 1831 led a rebellion of slaves in Virginia; he was captured and executed (1800-1831)

Denmark Vesey, Vesey - United States freed slave and insurrectionist in South Carolina who was involved in planning an uprising of slaves and was hanged (1767-1822)

Sir William Wallace, Wallace - Scottish insurgent who led the resistance to Edward I; in 1297 he gained control of Scotland briefly until Edward invaded Scotland again and defeated Wallace and subsequently executed him (1270-1305)