Here is my understanding of who had control over, or a piece of, the casinos in Vegas years ago:

The Flamingo - opened by Bugsy with NY $, primarily Genovese Family $ and Lansky. Bought by Hilton in 1971.

The Stardust - Chicago and Cleveland.

The Tropicana - Frank Costello and the Genovese's.

The Aladdin - St. Louis (Shenker) and Detroit

The Dunes - Chicago and St. Louis (Shenker)

The Sands - Genovese, Lansky and Stacher. Sinatra owned a piece later.

The Desert Inn - Dalitz, Cleveland and Chicago.

The Frontier - St. Louis (Giordano) and Chicago

The Riviera - Chicago

The Fremont, Circus-Circus & the Hacienda - Chicago briefly.

I agree, in the 1950's and 60's, the Genovese's controlled more casinos after the Outfit.

Best way to catch the smart ones? Get an idiot working for them.