Michael Francis Malone, aka... — T-Men Productions
It was an undercover agent !!
He used a Philly street backstory . He was Irish but looked like a Wop . He knew the language and customs.
He is the one who told the untouchables everything
He even had tons of fake gangster coded letters from Philly as he wanted Al’s men to open them and they did
He was the original Donnie Brasco
He wore a purple shirt and white hat I think