That’s the kind of guy Leo was: Win at any cost and treat the concept of unwritten rules as a contradiction in terms. (There was then no rule against spying from the bleachers.) Five years earlier his team also won the National League pennant (but he was not allowed to be there, suspended for having a sex life offensive to the Roman Catholic Church). That time the unwritten law he ignored forbade having a player who was the wrong color.
His spiritual heir was Al Davis, who bugged the visiting team’s locker room and was in the forefront of hiring Blacks and women, both to gain an edge. He would have signed Kaepernick.