The Great Leap Forward was an industrialization campaign within China from 1958 to 1962, led by the Chinese Communist Party (CCP). CCP Chairman Mao Zedong launched the campaign to transform the country from an agrarian society into an industrialized society through the formation of people's communes. The Great Leap Forward is estimated to have led to between 15 and 55 million deaths in mainland China during the 1959–1961 Great Chinese Famine it caused, making it the largest or second-largest famine in human history.