I have read two by William O. Douglas in the last year that I thought were excellent: Go East Young Man - The Early Years and The Court Years. Douglas has a lively writing style that I enjoy.
A couple of years ago I read The Memoirs of Chief Justice Earl Warren. It wasn’t as enjoyable a read as the Douglas book but very inciteful at the same time.
I might suggest The Bretheren by either Bob Woodward or Carl Bernstein (I can never remember which). It came out in the late 1970s (1977 I believe but it could be 78 or even 79).
While not an autobiography, it really captures what you are looking for in a very readable style.