A google search will bring up a lot of articles on Benny Binion. Here's a couple to start with...

The Las Vegas Review Journal did a book several years ago on 100 of the people who were influential in shaping Southern Nevada, and Benny was one of them:
http://www.1st100.com/part2/binion.html

An article on wikipedia:
http://en.wikipedia.org/wiki/Benny_Binion