In addition, Mike "The Greek" Potson was a Greek immigrant whose real name was Mihali Bodoglou and landed on US soil sometime around 1900, and at first he stayed in New York, then in St. Louis and by 1904 he was stationed in Chicago. He became close associate and trusted member of the Colosimo/Torrio/Capone group. (similar to Greek mobster Gus Alex who became top level guy decades later)

So, theres one possible myth or legend which has yet to be researched regarding Potson allegedly introducing Capone to an Orthodox Bible that was later allegedly used by Capone while inducting new members who allegedly had to place their hand on the Bible and to take an oath regarding unlimited loyalty towards the organization. I dont know if this happened before Capone was inducted into the Mafia or after that, or maybe it happened way before or since the days of Colosimo and Torrio, BUT STILL dont forget that we dont have a shred of evidence regarding the situation with the book, which means dont take it for granted.