The Central Committee's role has varied throughout history. It was founded in 1927 as a successor organization to the "Central Executive Committee" (), a group of party leaders charged with executing party work during the pre-revolutionary days of the CCP. Over the next several decades it served to confirm the party leadership lineup and legitimize military, strategic, and foreign relations decisions of the party. In practice, power was concentrated in a small group of military and political leaders (the Secretariat or the Politburo), and, beginning at the Zunyi Conference in 1935, Mao held great power personally. Moreover, during the Second Sino-Japanese war and the Chinese Civil War between 1937 and 1949, the Central Committee rarely convened, partly because of the logistical difficulties of bringing together leading cadres involved in different theatres of war and agitation.