Washington ? A Virginia man was sentenced to 150 years in prison for sexually exploiting minors and operating child pornography Web sites.

Gregory John Mitchel, who previously had been convicted of child pornography crimes, pleaded guilty in January to the production, distribution, sale and possession of child pornography.

Mitchel, 39, was sentenced Friday in federal court in Roanoke, the U.S. Attorney’s office for the Western District of Virginia said.

Officials found that Mitchel, of Dublin, Va., assisted in the daily operation of child pornography Web sites and filmed videos of minors engaging in sex acts.

Mitchel was implicated by Justin Berry, 19, who for five years starred in his own Web cam child pornography business and has testified before Congress about Internet child pornography.

Berry, of Bakersfield, Calif., also testified Friday against Ken Gourlay, of Detroit, who is charged with 10 felony counts related to sexual abuse and distributing sexually abusive material.

Berry testified he was sexually assaulted by Gourlay in 2002.