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Mykola Makarovych Marchak (Ukrainian: Микола Макарович Марчак; 5 January 1904 – 23 September 1938) was a Ukrainian and Soviet politician, who was the acting Chairman of the Council of People's Commissars of the Ukrainian SSR (today's equivalent of prime-minister) from October 1937 to February 1938. He was a son of a peasant and was a member of the Russian Communist Party (b) from 1921.