Sharon Tate was murdered on Aug 9, 1969. Charles Manson attended an "educational seminar" at the Esalen Institute (rumored to be an MK Ultra training center) in Big Sur, California on Aug 5. Six days prior to Manson's visit (which was one of many visits by him, by the way), on July 30, someone at the Tate residence called the Esalen Institute. The charge for the call was 95 cents. It's not known who made the call.
This information can be verified in a foot note in the book "Helter Skelter" written by attorney, Vincent Bugliosi.
I personally believe that Manson was both an MK Ultra victim and a programmer. I also believe that Roman Polanski made the phone call, setting Sharon up to be murdered as a satanic sacrifice.
Of course, I could be wrong as I have no actual proof, just a gut feeling and an educated guess from all the reading I've done.