Was the so called "black hand" comprised of Siclians, Neapolitans, and Calabrians?

Or was it just a generic term for the mob or Southern Italian criminal groups before people really knew about the Sicilian mafia?

Did they mainly do extortion or black mail as it says on wikipedia or did they do other things like gambling, numbers games or the "Italian lottery" some immigrants played, selling illegal alcohol during prohibition, running brothels or doing stuff with prostitutes, and money lending?

Were a lot of them in places like Western PA in or near Pittsburgh, across the close border in WV, and Youngstown Ohio in the 1900s through 1940s?

Did most just do it as a way to earn extra money to help their family and then stop, did some get sorta forced into it, or did the Sicilian mob accept them and ask them to work for them?