Stalinism, while not an ideology "per se", refers to Stalin's thoughts and policies. Stalin's introduction of the concept "Socialism in One Country" in 1924 was a major turning point in Soviet ideological discourse. The Soviet Union did not need a socialist world revolution to construct a socialist society, Stalin claimed. Four years later, Stalin initiated his "Second Revolution" with the introduction of state socialism and central planning. In the early-1930s, he initiated collectivization of Soviet agriculture, by de-privatizing agriculture, but not turning it under the responsibility of the state, "per se", instead creating peasant cooperatives. With the initiation of his "Second Revolution", Stalin launched a "Cult of Lenin" and a cult of personality centered upon himself. For instance, the name of the city of Petrograd was changed to Leningrad, the town of Lenin's birth was renamed Ulyanov (Lenin's birth-name), the Order of Lenin became the highest state award and portraits of Lenin were hung up everywhere; in public squares, factories and offices etc. The increasing bureaucracy which followed after the introduction of a state socialist economy was at complete odds with the Marxist notion of "the withering away of the state". Stalin tried to explain the reasoning behind it at the 16th Congress (held in 1930);