CORCORAN, Calif. (AP) _ Charles Manson has been transferred back to Corcoran State Prison after serving time in another maximum-security lockup for peddling drugs to fellow inmates.

Manson was sent to Pelican Bay State Prison in Crescent City, on California's north coast, in August, prison spokeswoman Sylvia Gonzalez said Friday.

He has since completed the sentence and returned to Corcoran, about 170 miles north of Los Angeles, Ms. Gonzalez said.

Manson was sent to Pelican Bay by a disciplinary committee at Corcoran. He was transferred so he could not mingle with the same inmates with whom he was dealing drugs, Ms. Gonzalez said.

Manson is back in a protective custody unit, which holds about three dozen of the state's most notorious inmates, including Sirhan Sirhan, the assassin of Robert Kennedy.

Manson is serving a life sentence on his 1971 conviction of masterminding seven murders on two nights in 1969. One of the victims was actress Sharon Tate, the pregnant wife of film director Roman Polanski.