Foi Alfie Solomons quem deu a informação.
"Thomas's son, Charlie, is kidnapped. Father Hughes reveals to Thomas that he knows about his subterfuge, including the tunnel into the Russian vault and sabotaging the train bombing plot. He demands the jewels as payment and for Thomas himself blow up the train - which must kill six people, in exchange for the safe return of his son. Thomas agrees unconditionally. After some investigation he discovers that Alfie Solomons divulged the plans to Father Hughes." (Source)
"Tommy then meets with Alfie asking for names of people who would buy a Faberge Egg. When Alfie gives him a list, Tommy's suspicions are confirmed as Alfie has excluded a name. Tommy had also asked for the same list from his jewelers. Tommy tells Alfie that Alfie's been working with the Oddfellows and Alfie says that he wanted to the gold." (Source)