Ivy, that is true by the 1960s the Genovese and Chicago were powerful in Las Vegas, but that was cause Chicago muscled their way in. Don't forget that Cleveland and Detroit had the most pull with Hoff to get those loans.
Buffalo had there hand in Reno, till they stared a war with Cleveland, this started over in Pennsylvania in the 1928. When buffalo's Joe Debenedetto was killed in 1929. The buffalo associates went to other families, or moved back to Buffalo.
There are Cleveland and Pittsburgh posters on here and I am sure they can give more information of that.