WASHINGTON, Apr. 25 — The Supreme Court today refused to hear the appeal of convicted mass-murderer Charles Manson and three members of his “family” who were found guilty in the brutal slayings of seven persons in 1971.

The justices let stand a decision by the California Supreme Court that Manson and the others received a fair trial.

Attorneys for the four argued that numerous trial errors, prejudicial publicity, failure to move Manson’s trial out of Los Angeles and misconduct by prosecutors denied the four a fair trial.

Manson and followers Patricia Krenwinkel, Susan Atkins and Leslie Van Houten were convicted for the murders of five persons at the home of actress Sharon Tate and a double murder at the nearby home of a wealthy businessman.

Attorney Irving Kanarek told the court the four convicted murderers deserve a new trial. He said Manson and the others are “innocent of the crimes charged” and had been exploited by the news media for “income-producing purposes” and by California officials interested in “self-glorification.”

“The lynching of (Manson and the others) under the auspices of prosecutorial forces in California in league with the mass media is obvious,” Kanarek said.

Manson was sentenced to die in the gas chamber but California since has struck down its death penalty statute. He now faces life in prison.

A former Manson disciple, Linda Kasabian, was a key prosecution witness at Manson’s trial. His appeal said the trial judge made a mistake by not ordering a test to determine Miss Kasabian’s mental competence.

Kanarek said her mental health had been affected by the habitual use of the drug LSD.

By RICHARD CARELLI