SAN FRANCISCO, Jul. 27 — Charles Manson “family” member Robert Beausoleil has filed a petition with the California Supreme Co. asking for a reversal of his conviction on a first-degree murder charge.

Beausoleil filed a request for a hearing Thursday, contending the Court of Appeal had erred when it ruled against him on a change of venue request.

A jury found Beausoleil guilty in the torture stabbing of Gary Hinman in Los Angeles in July 1969. The Court of Appeal upheld the conviction but modified the sentence to life imprisonment because of court decisions holding the death penalty unconstitutional.

His petition said the change of venue ruling perpetuated a dental of his constitutional right to due process of the law and that he had been subjected to trial in “an atmosphere of hatred and dislike.”

It further contended the appeals court permitted him to be deprived of due process by “condoning the exercise of great pressure by a trial judge against a reluctant witness to testify against Beausoleil and cooperate with the prosecution.”