A united front is an alliance of groups against their common enemies, figuratively evoking unification of previously separate geographic fronts or unification of previously separate armies into a front. The name often refers to a political and/or military struggle carried out by volunteers or revolutionaries, including revolutionary socialism, communism, or anarchism, among others. The basic theory of the united front tactic among socialists was first developed by the Communist International, an international communist organization created by communists in the wake of the October Revolution. According to the thesis of the 1922 4th World Congress of the Communist International: