During the trial, Leslie Van Houten's trial attorney, Ronald Hughes, refused to go along with the group's plan for the women to take the fall for Manson, the mastermind behind the murders. He disappeared in 1970 and his badly decomposed body was found the next year. It was never determined how he died.
Van Houten was sentenced in 1970 on two counts of murder and one count of conspiracy to commit murder for her role in the LaBianca murders.
Hughes' death led to a mistrial in Van Houten's case and she was re-tried. The trial ended with a hung jury. A third and final trial in 1978 upheld the conviction and Van Houten, after being out for six months on bail, was sent back to prison for life.
Atkins, who slaughtered Tate as the actress begged for the life of her unborn child, died in September at 61, weeks after she appeared, weakened and feeble, at her final parole hearing to ask for the right to die at home. The request was denied.
Krenwinkel's next parole hearing is scheduled for January 2011.
Although the Manson clan is aging, they still try for parole regularly, keeping their victims' families on their toes. None of their victims' kin have been as active as Debra Tate. She has been designated as the unofficial coordinator for such efforts and this year, for the first time, she has been asked to be a spokeswoman for the LaBianca family.
Tate said there will be relatives of the LaBianca's at the hearing but that they have typically shied away from the media.
With Watson scheduled for a parole hearing later next year and Manson in 2012, Tate will have seen at least one Manson family member up for parole for four straight years. She also carefully watches the activity of other Manson family members that weren't involved in her sister's murder, such as Davis and convicted murderer Bobby Beausoleil.
"We also have to remember that they have personality factors that make them followers and not leaders and there are still currently all linked together and I see that as a huge problem," she said.
"We just can't give them the chance," she said. "They didn't give any of the victims the chance whatsoever."
But Tate knows that it's never a slam dunk to keep them in prison, pointing to the parole recommendation for Davis and last year's release of high-ranking Manson follower Lynette "Squeaky" Fromme, who was convicted of the attempted assassination of President Gerald Ford.
"These are serial killers," Tate said. "These would be domestic terrorists if it was today. So these are very dangerous people."