Charles Milles Manson is an American criminal who led the "Manson Family," a quasi-commune that arose in the U.S. state of California in the later 1960s. He was found guilty of conspiracy to commit the Tate-LaBianca murders, which members of the group carried out at his instruction. Through the joint-responsibility rule of conspiracy, he was convicted of the murders themselves.

Manson is associated with "Helter Skelter", the term he took from the Beatles song of that name and construed as an apocalyptic race war that the murders were intended to precipitate. This connection with rock music linked him, from the beginning of his notoriety, with pop culture, in which he became an emblem of insanity, violence, and the macabre. Ultimately, the term was used as the title of the book that prosecutor Vincent Bugliosi wrote about the Manson murders.