Turnbull, on the subject of non-Italians in the role of consigliere or key adviser, add Murray "The Camel" Humphreys, whose role in the Chicago mob is often overshadowed by the Outfit bosses in Chicago during his lifetime. It's entirely possible his influence was downplayed or undervalued becaused of his heritage. None-the-less, it's easy to draw a parallel between "German-Irish" Tom Hagan and Welshman Murray Humphreys, both of whom wielded influence among their associates during the 1940's thru 1960's...though I would argue that Hump might have been more valuable in real life than Hagan was in fiction!
Also, there was a Welsh rock band that went by the name of "Murry the Hump" having chosen their name as a tribute to their fellow Welshman!
"Prince of Crime" is a good read about Humphries, as is Russo's "The Outfit."
tony b.