Of interest. The Amazon page has the back cover blurb mostly showing praise from Lennon.
Allen Klein : The Man Who Bailed Out the Beatles, Made the Stones, and Transformed Rock & Roll
by Fred Goodman
An account of the heyday of rock & roll through the lens of Allen Klein, the business manager, producer, and gadfly who "broke up the Beatles" and showed the Rolling Stones how to become the pre-eminent dynasty in popular music.
ISBN-13/ EAN: 9780547896861
Publication Date: 06/23/2015
Fred Goodman, author of ALLEN KLEIN, talks to Access Hollywood about the controversial manager and his notorious relationship with The Beatles.