@GaryMartin - Your source is correct about Accardo sponsoring Giancana. Giancana was Accardo's underboss until he retired in 1956/57, and Accardo pushed for him to be his successor. The characteristic that stood out in Giancana was ruthlessness. However, after the Apalachin meeting things changed. It forced Hoover to make changes with how he dealt with organized crime. He sent agents in every city where the Mafia operated and ordered them to gather intel. They observed and developed informants and planted bugs. They also made their presence known as dedicated agents who could not be bribed and corrupted (with a few exceptions) like the local police. Giancana's narcissism prevented him from changing his arrogant attitude and show respect. There was even precedent from Ricca, Campagna and other Outfit mobsters when they were tried for the Hollywood extortion case in 1940. They showed respect to the court and understood that to do otherwise would only hurt themselves. Giancana didn't learn that lesson until he was no longer needed.

@MemphisMafia - DeStafano told Roemer that he wasn't made and he believed him, but he wasn't the only one. Chuck Crimaldi, who was an enforcer for DeStefano (and later an informant), also believed he wasn't made. Others identified him as a made guy. I believe he was because of his direct access to Giancana and Accardo and the business arrangements he had with them.