A former guard who helped the Black Guerilla Family gang smuggle drugs and other contraband into the Baltimore City Detention Center was sentenced to over two years in prison on Friday in federal court in Baltimore. Sean Graves, 48, of Windsor Mill, received 28 months for participating in a racketeering conspiracy. Earlier last week, four other former correctional officers pleaded guilty to roles in the racketeering conspiracy. To date, 34 of the 44 defendants charged in the conspiracy have pleaded guilty, including 21 correctional officers. One defendant has died.