A New Haven man has been sentenced to more than 21 years in federal prison for distributing methamphetamine and cocaine, as well as violating the terms of his supervised release following a previous conviction. David X. Sullivan, United States Attorney for the District of Connecticut, announced that Donald Ogman, also known as “Mainey-O” and “Manny O,” received a sentence of 252 months in prison from U.S. District Judge Vernon D. Oliver in Hartford. After serving his sentence, Ogman will be subject to eight years of supervised release.
According to court documents and statements made during proceedings, Ogman was identified as a leader of the Grape Street Crips (GSC), a violent gang based in New Haven. In 2012, he was arrested by the FBI on charges related to drug trafficking and other offenses connected to his role in GSC. He pleaded guilty to narcotics offenses and was sentenced on March 10, 2015, to 188 months in prison with five years of supervised release.
In August 2022, a federal judge granted Ogman’s motion for compassionate release, reducing his sentence to time served and allowing him to leave prison early.
After his release, authorities say Ogman resumed drug trafficking activities while under federal supervision. He distributed multi-colored pills containing methamphetamine marketed as ecstasy and sold crack cocaine in the New Haven area. Law enforcement conducted surveillance operations, trash searches, and controlled purchases between November 2023 and April 2024 as part of their investigation.
Ogman was arrested on May 9, 2024. Searches at that time found additional quantities of methamphetamine and crack cocaine on his person and at his residence. A loaded firearm was also discovered at another location used for storing drugs.
He has remained detained since his arrest. On April 16, 2025, Ogman pleaded guilty to several charges: one count of possession with intent to distribute and distribution of methamphetamine; three counts involving possession with intent to distribute and distribution of more than 50 grams of methamphetamine; and one count involving possession with intent to distribute more than 50 grams of methamphetamine along with an unspecified quantity of cocaine.
Judge Oliver imposed a sentence consisting of 228 months for the new drug offenses plus an additional consecutive term of 24 months for violating conditions tied to his earlier supervised release.
The investigation involved multiple agencies including the DEA New Haven District Office Task Force (NHDO), Bureau of Alcohol, Tobacco, Firearms, and Explosives (ATF), New Haven Police Department, Hamden Police Department, U.S. Marshals Service, Internal Revenue Service – Criminal Investigation Division, Connecticut State Police as well as police departments from Waterbury, East Haven, Branford, West Haven, Ansonia, Meriden, Naugatuck and Shelton.
Assistant U.S. Attorneys Stephanie T. Levick and Nathan J. Guevremont prosecuted the case through the Organized Crime Drug Enforcement Task Forces Program (OCDETF).
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