 From February to July 1933 Skrypnyk headed the Ukrainian State Planning Commission, became a member of the Politburo of the CP(b)U and served on the Executive Committee organizing the Communist International, as well as leading the CP(b)U's delegation to the Comintern.In January 1933, Stalin sent Pavel Postyshev to Ukraine, with free rein to centralize the power of Moscow.Postyshev, with the help of thousands of officials brought from Russia, oversaw the violent reversal of Ukrainization, enforced collectivization of agriculture, and conducted a purge of the CP(b)U, anticipating the wider Soviet Great Purge which was to follow in 1937.