There was discord in the ASU over the organization's changing position to European armament after 1938, with the Socialist-oriented members generally favoring continuation of the organization's historic opposition to militarism and Communist-oriented members arguing in favor of rearmament and collective security in Europe. The break came the following year, however, with the November 1939 Soviet invasion of Finland. The ASU leadership, consisting by that time of a Communist majority, dutifully supported the military action of the Soviet Union, prompting the Socialist minority to split the organization.