Two Prince George’s County men involved in separate crimes were sentenced to lengthy federal prison terms Wednesday, according to U.S. Attorney Rod J. Rosenstein.

Kelvin B. Williams, 34, of Seat Pleasant, was sentenced to 11 years and eight months in prison by U.S. District Judge Alexander Williams Jr. The judge also ordered Williams, who had pleaded guilty to conspiracy to commit armed robbery and brandishing a handgun during a crime of violence, to remain on three years of supervised release.

Williams pleaded guilty in connection with a spate of armed robberies of businesses in Prince George’s County during a two-month time frame, authorities said.

According to Williams’s plea agreement, from June 18 through August 3, 2009, Williams and two accomplices, Paul Lewis and Carlos Rodriguez, conspired to rob seven businesses in Prince George’s of more than $22,900. Williams and Lewis used black revolvers during the crimes, while Rodriguez used a BB gun that looked like handgun, authorities said.

Williams, Lewis and Rodriguez pointed the weapons at employees and patrons during the robberies, federal prosecutors said.

The three men robbed the following stores: the Ashley Stuart Clothing Store, at 7001 Martin Luther King Highway in Seat Pleasant; the Last Stop Clothing Store, at 6185 Oxon Hill Road, in Forestville; the Famous Pawnbrokers at 5405 Annapolis Road in Bladensburg; the Game Stop at 5706 Silver Hill Road in District Heights; and Penn Mar Liquors, at 3022 Donnell Drive in Forestville. On July 27, 2009, Williams alone robbed the Game Stop in Forestville, taking more than $2,700 in cash, four PlayStation 3 consoles and a PlayStation game.

Lewis, 30, of Landover, and Rodriguez, 21, of Fairmont Heights, have each pleaded guilty to participating in the robberies. Lewis was sentenced to 10 years in prison, and Rodriguez was sentenced to four years and seven months in prison, officials said.

In an unrelated case, Williams on Wednesday sentenced Charles Lee Smoot, 41, of Hyattsville, to 19 years and seven months in prison, followed by five years of supervised release, for being a felon in possession of a firearm.Williams enhanced Smoot’s sentence after finding that Smoot was a career criminal, based on two previous convictions for drug crimes and a conviction for assault on a police officer, authorities said.

According to evidence federal prosecutors presented at Smoot’s trial, Hyattsville police arrested Smoot at a home at Hyattsville on Oct. 3, 2008, after receiving a tip.

While frisking Smoot, police founded a loaded .38-caliber revolver in his waistband, prosecutors said.