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In page Heroin:
"Heroin trafficking was virtually eliminated in the US during World War II because of temporary trade disruptions caused by the war. Japan's war with China had cut the normal distribution routes for heroin and the war had generally disrupted the movement of opium. After World War II, the Mafia took advantage of the weakness of the postwar Italian government and set up heroin labs in Sicily which was located along the historic route opium took westward into Europe and the United States.[1] Large-scale international heroin production effectively ended in China with the victory of the communists in the civil war in the late 1940s.[citation needed] The elimination of Chinese production happened at the same time that Sicily's role in the trade developed.
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