Just read an interesting story from an American Movie Classics Magazine (don't know the date)
But what it says is:-
Has anyone else heard this story. Obviously I don't know who Leo Durocher was, or is, but I think it shows a great presence and restraint from John Wayne.
During the making of Tycoon (1947) the normally accommodating John Wayne found it necessary to have visitors barred from the set. Wayne was loath to initiate such action since he enjoyed having guests watch him work, but one visitor in particular had made it extremely difficult to get anything done. Co-star Laraine Day who played Wayne's romantic interest, had recently married Leo "The Lip" Durocher, the short tempered shortstop wjo wouild one day manage the New York Giants to three National League titles. It seems as far as Durocher was concerned, the ball field wasn't the only place his anger flared. Convinced that the love scenes between Wayne and Day looked too real to be simply "acted", Durocher bounded the set, glaring at Wayne and making remarks so nasty that Wayne found it impossible to concentrate on the scenes. He finally demanded that the set be closed to all visitors - the first and only time in his career he was compelled to such lengths.
In todays standards someone would have decked the intruder.