1947 to 1951, FRANCE
According to Alfred W. McCoy in The Politics of Heroin in Southeast Asia, CIA arms, money, and disinformation enabled Corsican criminal syndicates in Marseille to wrestle control of labor unions from the Communist Party. The Corsicans gained political influence and control over the docks--ideal conditions for cementing a long-term partnership with Mafia drug distributors, which turned Marseille into the postwar heroin capital of the Western world. Marseille's first heroin laboratories were opened in 1951, only months after the Corsicans took over the waterfront.