Here's some more from the same book, about that same column by Shaughnessy and the aborted Larry Bigbie trade that led Theo to temporarily leave the team:
"Either Lucchino or Steinberg, Epstein felt sure, had prompted the column. The two men were, after all, the heroes of the piece, and both had said lines almost identical to some Shaughnessy had used. Where else could Shaughnessy have gotten the incorrect notion-repeated in the column as fact, without any attribution-that Epstein had asked Lucchino to shoulder the blame for the Bigbie trade? It was actually Henry and Epstein who had decided to nix the deal; Lucchino had never been part of the conversation."
"About a week earlier, several sources confirm that Steinberg had a conversation with Shaughnessy and another reporter in which he said many of the things that ended up in Shaughnessy's column."
"Over the next several months, Shaughnessy repeatedly insisted that neither Lucchino nor his allies within the organization had urged him to write the October 30 column. But on November 1, Shaughnessy wrote that the version of the Bigbie trade he wrote as fact was 'the version held by Lucchino's camp (three sources)'. Wherever he got the information, it simply wasn't true. 'I vetoed the trade,' says Henry. 'It was me, after Theo and I talked about it. It was never Larry. He had nothing to do with it.'"
So in essence, Lucchino lied, and Shaughnessy repeated the lie, and Henry went on record to call it a lie.