>> as for prosecutor vincent, he was on a mission to prove that manson master-minded the tate-labianca murders. the prosecutor established a motive early on -- manson was trying to incite a race war he called helter skelter. >> i proved through witnesses that manson was the only one that had a motive in these murders and that motive was helter skelter. >> manson foresaw the black man would win this war. later he said the black man would have to look around at those white people who had survived. who had escaped helter skelter. in other words, turn over the reigns of power to charles manson and his family. >> to prove manson was the mastermind, he needed a witness from inside the manson family. a witness like barbara hoyt. >> i was afraid. they threatened my family. i got different death threats at different times.