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 an important moment in Soviet ideological discourse. According to Stalin, the Soviet Union did not need a socialist world revolution to construct a socialist society. Four years later, Stalin initiated his "Second Revolution" with the introduction of state socialism and central planning. In the early 1930s, he initiated the collectivization of Soviet agriculture by de-privatizing agriculture and creating peasant cooperatives rather than making it the responsibility of the state. With the initiation of his "Second Revolution", Stalin launched the "Cult of Lenin"a cult of personality centered upon himself. 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 in public squares, workplaces and elsewhere. The increasing bureaucracy which followed the introduction of a state socialist economy was at complete odds with the Marxist notion of "the withering away of the state". Stalin explained the reasoning behind it at the 16th Congress held in 1930;