In prosecution on drug and firearm charges, Dist. Ct. did not err in imposing three terms of supervised release that directed defendants to limit contact with known felons, imposed alcohol-related restrictions and prohibited them from using dangerous weapons. Prohibition on knowingly having contact with felons was not impermissively vague since limitation had scienter element and defendants could seek permission from probation officer to contact other members of their family who were felons. Moreover, restriction on alcohol consumption was permissible, where both defendants had prior history of either excessive alcohol consumption or alcohol-related convictions. Also, Ct. rejected defendants' claim that instant firearm possession prohibition was improper because they had no prior notice of potential for Dist. Ct. to impose such condition, where Ct. noted that such prohibition was enumerated special condition of supervised release contained in sentencing guidelines. Also, said condition was proper given defendant’s convictions on unlawful possession of firearm charges.