ISTR Gil mentioned something about two WML? principals not speaking to each other except to play the game, but I forget the details. I haven't read through his book since 1978.
John stopped speaking to Dorothy for a period (other than to play the game) after he discovered that she was reporting their backstage chit-chat in her column.
There was also a 1957 incident when Daly kiboshed Mike Wallace as a mystery guest. (Daly was head of ABC News at the time and objected to Wallace being hired for a new interview show. In particular, Wallace’s interview with crime figure Mickey Cohen the prior week had resulted in the airing of possibly libelous statements about the LA chief of police.) Anyway, Daly threatened to no-show, and Sammy Davis Jr. was substituted. Daly probably regarded the whole thing as a private backstage matter, but the next day’s Journal-American carried a front-page item about the mystery guest swap. I think Fates said there was no byline, but it didn’t take much guesswork to determine who might’ve written it, and Daly avoided speaking to Kilgallen for several weeks, other than gameplay.