There is no Mafia. Only "this thing".
Are you sure the South Colorado faction were rivals? I think they would be a territory of the Smaldone family. Or at least that's how this thing is structured out here.
I found 3 James Cavaleris. One's an older guy (born 1913 in Denver) that I can't find much about. The other two were uncle and nephew... The uncle was born in 1920 and died in 2009; the other was born in 1939 (same year as Bonnie) and died in 1968 (the year before she moved to WV).
What made them think that he was involved in this thing? Italian + criminal? In WV, they used to (and the older ones still do) think that all Italians were. When my dad (who's from NJ and had a friend whose dad was "a wholesaler") moved to Charleston after college, he had a friend in WVSP who was transferred to the organized crime unit. After being there a few years, he said, "Did you know that there's no Mafia in WV?" (Dad's response was, "...yeah!") "All of those Italians in Charleston, Clarksburg, and Wheeling? They're all just... Italians!"