Larry Melton aka White Rabbitt.  Manson Family who was the main source for the book "The Family" written by Ed Sanders and published in the early 1970's. 

One page handwritten letter in which Melton is inquiring why he's not heard back regarding letters he alleges to have received from Blue (Sandy Good), Charlie (Manson) and Tex (Charles Watson).
Signed three times, "Larry Melton" and twice, "White Rabbitt".

Larry Melton Manson Family White Rabbitt Prison Letter Signed Twice