This museum is located in the downtown part of Las Vegas, inside the former federal courthouse and U.S. Post Office. The building is very beautiful on the outside and inside and I, originally, had no idea what it's uses had been before being converted into this museum.
Once you've paid your admission ($19.95 for adults, $13.95 with a local id) you're directed to the elevators/staircases and told to begin on the third floor and work your way down. This is a solo walking tour and throughout each floor you encounter a new era/category of organized crime. Most notable exhibits (to me) were:
1. The actual bricks from the Saint Valentine's Day Massacre recreated into a wall.
2. Memorabilia and evidence from the actual Kefauver Committee hearings.
3. The Mob in pop culture.
The only complaint I had is that the area from exhibit to exhibit was narrow and slim at some points and with a packed museum, I had to overlook some things just to get away from the crowds. I'd assume, however, that would be incentive to get people to come back a second and third time, but now that I've been once, I'm pretty sure I'm good with that one visit. I do recommend checking this place out, though.