Kenneth McGriff

Kenneth "Supreme" McGriff is an American convicted former drug lord and gangster from New York City. McGriff began serving his life sentence at ADX Florence, a federal supermax prison in Colorado. In 2011, he was transferred to the United States Penitentiary, Lee, a high-security federal prison in Pennington Gap, Virginia. As of 2025, he is housed at USP Beaumont in Jefferson County, Texas.