In 1930 the Central Committee departments were reorganised, because the Secretariat had lost control over the economy, because of the First Five-Year Plan, and needed more party personnel to supervise the economy. Prior to 1930, Central Committee departments focused on major components of "political work". During Stalin's rule they were specialised. The departments supervised local party officials and ministerial branches within their particular sphere. Four years later, in 1934, new Central Committee departments were established which were independent from the Department for Personnel. Stalin's emphasis on the importance of political and economic work led to another wave of reorganisation of the Central Committee departments in the late-1930s and 1940s. At the 18th Party Congress (10–21 March 1939) the department specializing in industry was abolished and replaced by a division focusing on personnel management, ideology and verification fulfillment. At the 18th Party Conference (15–20 February 1941) it was concluded that the abolition of the Central Committee Department on Industry had led to the neglect of industry. Because of this, specialised secretaries became responsible for industry and transport from the center down to the city level.