HARTFORD – A reputed organized crime figure faces more than four years in prison after pleading guilty to drug trafficking and gun possession in federal court Wednesday, but his attorney said later that the charges would have been dropped if he had been able to provide key information about the long-unsolved theft of artwork from the Isabella Stewart Gardner Museum in Boston.

Robert V. Gentile, 76, of Manchester, Conn. assisted federal authorities for 10 months before his arrest in February but his information was not considered valuable as to who stole the paintings or where they might now be, A. Ryan McGuigan, Gentile’s lawyer, said after the hearing in US District Court.