Wikipedia: CIA and Contras cocaine trafficking in the US
Central Intelligence Agency The involvement of the United States Central Intelligence Agency (CIA) in cocaine trafficking in Central America during the Reagan Administration as part of the Contra war in Nicaragua has been the subject of several official and journalistic investigations since the mid-1980s. Early reports "Once you set up a covert operation to supply arms and money, it's very difficult to separate it from the kind of people who are involved in other forms of trade, and especially drugs. There is a limited number of planes, pilots and landing strips. By developing a system for supply of the Contras, the US built a road for drug supply into the US." In 1984, U.S. officials began receiving reports of Contra cocaine trafficking. In 1985, another Contra leader "told U.S. authorities that his group was being paid $50,000 by Colombian traffickers for help with a 100-kilo cocaine shipment and that the money would go 'for the cause' of fighting the Nicaraguan government."
Related: Iran-Contra & Contra Drug Smuggling
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