Charles Manson had NOTHING to do with the Far Right, or with anything else even remotely American.
He inspired Jonestown. The Peoples Temple Agricultural Project, better known by its informal name “Jonestown”, was a remote settlement established by the Peoples Temple, an American cult under the leadership of “Reverend” Jim Jones, in northwestern Guyana.
Most famously, the term “drink the Kool-Aid” came out of the sudden and catastrophic collapse of that colony.
I don't think that is true. But Jim Jones was close allies with Bay Area Democrats when he was in the Bay Area.