The Seventh Party Congress, held in June 1958, proved even more uneventful. It passed the Third Five-Year Plan for the development of the economy, the fulfillment of which was drastically reduced to three years even before the ink was dry on the document. With Central Committee approval, new plans for economic targets were prepared; meanwhile, Zhivkov prepared an elaborate propaganda campaign to push this program through. Zhivkov's Theses, as the collection of instructions have come to be known, advocated increased cultivation and production in agriculture and industry to obtain yields that were double those of previous plans. An unprecedented flurry of activity followed on the heels of extensive media coverage. Aided by the press, the Agitation and Propaganda Department under the Central Committee's direct supervision launched a vast campaign that surpassed even those efforts in neighboring countries. This period is characteristically known as Bulgaria's Great Leap Forward, patterned after the Chinese experience, and historians put forth political and economic motives for such an economic experiment. Politically, after Nikita Khrushchev started his de-Stalinization policy in the Soviet Union, the Bulgarian repercussion was evident in Chervenkov's disenchantment with the Soviet trauma and his looking favorably instead toward the Chinese example. The Great Leap Forward was neither a spectacular success nor a dismal failure and achieved no more than the expected progress in three year's time. The ensuing period marked a return to earlier patterns and heralded the end of Chervenkov's political career and the concurrent elevation of Zhivkov. The election of Zhivkov's friends--Stanko Todorov and Mitko Grigorov--to full membership in the Politburo gave him added support. Khrushchev's visit as the head of a large Soviet government delegation did not hurt Zhivkov but rather gave convincing proof of Khrushchev's support of the Bulgarian first secretary. Anton Yugov was premier at this time, but it was not long before he too was purged, the final blow coming only hours before the start of the Eighth Party Congress. The Eighth Party Congress in 1962 marked the end of the open opposition to Zhivkov's leadership. With Chervenkov and Yugov out, Zhivkov was in full control. A month earlier, in October 1962, a special plenum of the Central Committee announced Zhivkov's assumption of government power as premier while retaining the first secretaryship of the party. In the economic sector, the Twenty-Year Plan of Economic Development--patterned on that of the Soviet Union--had been passed. It featured more realistic goals in contradistinction to its predecessor. As usual, heavy industrial priorities ranked high in the development plan.