Especially the questions how they formed and were structured, and the "mentality" behind them. (i.e. do Italian Mafias really care about "the family" that much etc.)
I'm mostly interested in the Italian, Jewish and Irish crime organisations.
Questions need to be direct and concise. General "tell me about X" questions are frowned upon.
We can talk about the "Family" in the Italian Mafias (allegedly this only really became a thing after The Godfather popularized it, but this isn't my wheel house so I won't speak to it) but otherwise you're going to want to phrase questions as directly as possible.