Charles Manson was a killer. He planned who would be killed, and also instructed his "family" how to commit the crime. Helter Skelter was supposed to show "blackie" how to kill, and start a revolution. The family was going to sit it out in the yellow submarine, a small bunker Manson had on a farm in California.
Where's the proof? You're supposed to have proof beyond a reasonable doubt in a court of law, not a bunch of hearsay. Talking about a race war is not against the law, nor is it proof that he conspired to commit homicide.