WME is said to be in the early stages of shopping the project to studios to co-finance and co-distribute the venture, similar to the way Tarantino and the Weinsteins made the filmmaker's 2009 movie Inglourious Basterds, which had Universal Studios as a financial and distributing partner.

Sources say that Tarantino is putting the finishing touches on the script and that Brad Pitt, who worked with the filmmaker on Basterds, and Jennifer Lawrence have been approached. Studios could receive the package after Labor Day, according to one source. The plan is to shoot in 2018, possibly in the summer.

Script details are scant but one of the stories centers on Sharon Tate, the actress and wife of director Roman Polanski who was murdered by Manson and his followers in 1969.

Manson had ordered a group of his followers to attack the inhabitants of a house in the Benedict Canyon area of Los Angeles, believing it was owned by a record producer who earlier had rejected him.

Over the course of several hours on the night of Aug. 8, the four followers, using guns and knives, brutally killed Tate, who was eight months pregnant, and four other occupants.

In 1971, Manson and members of his crew were sentenced to life imprisonment for these and several other murders committed that summer.

If the Manson-Tate project does become Tarantino's next film, it will be his first movie based on true events.

Any talks with actors are in the early stages, and one insider said that Lawrence is not considering the Tate role.

WME had no comment.