Mahdi, agent provocateur, agitator, agitprop, bell cow, bell mare, bellwether, born leader, boss, cacique, catalyst, charismatic leader, choirmaster, choragus, conductor, coryphaeus, demagogue, duce, exciter, file leader, firebrand, fomenter, forerunner, fugleman, incendiary, inciter, inflamer, inspired leader, instigator, keynoter, leader, leader of men, man higher-up, messiah, mischief-maker, pacemaker, pacesetter, policy maker, precentor, provocateur, provoker, rabble-rouser, rouser, sachem, seditionary, seditionist, standard-bearer, symphonic conductor, torchbearer, troublemaker, urger