In 1959, while serving a sentence at the Green Haven Correctional Facility in Upstate New York, Madonna became acquainted with Nicky Barnes, a young drug dealer from Harlem. After their release from prison, Madonna started supplying large quantities of heroin to Barnes. Madonna would drop off a car with a trunk full of heroin at a Manhattan parking lot. Barnes would pick up the heroin later and exchange it for cash. A few days later, Madonna would return to pick up the car with the cash. Madonna and Barnes continued this arrangement until 1975, when Madonna was arrested for drug trafficking. On December 21, 1976, Madonna was sentenced to 30 years in federal prison.