Dapper Don, i dont know who the most powerful jewish mobster is today... but in my opinion Meyer Lanksy was the most powerful jewish mobster of the 20th century.... Turnbull,thats very interestin and insightful info man. i agree, modern day Las Vegas in reality was developed mostly by Lanksy and Dalitz... i also thik that if Siegel hadnt been whacked out, he wouldve became what Dalitz later became to Las Vegas. the Flamingo idea and project was really William Wilkerson's, before Siegel muscled in and took it from him..... most sources like to credit Siegel for "invisionin" modern day Las Vegas, but thats actually b.s..... i guess it makes his legend look better by givin him credit for that. its also like his death, which was never solved but was speculated that it was Frankie Carbo, Chick Hill, etc that whacked him out...but in the book "Family Secret" it says that:

"On June 20, 1947 one of the most notorious gangsters of the twentieth century, Benjamin "Bugsy" Siegel, was murdered in the Beverly Hills mansion of his mistress, Miss Virginia Hill. While there have been numerous theories in regard to who actually killed "the father of Las Vegas," the fact remains, the Siegel murder case is still officially unsolved...until now.
In 1941, when Bob MacDonald married Betty Ann Rockwell, it appeared as though their relationship was the start of a very majestic affair. The teens were from the upper class of Southern California society, exceptionally good looking, and by all accounts it seemed to be foreordained that they would live a full and happy life. MacDonald’s father, Archibald, was the right-hand man to America’s wealthiest man, Howard Hughes, Jr., while Betty Ann’s mother, Gaynell Rockwell-Applegate, was a woman of "new money." At a glance, it seemed as if the couple should have lived a life with a storybook ending. Sadly, in 1947, the life of splendor expected for the couple turned into a family nightmare with horrendous consequences.

On September 13, 1947, without apparent reason or motive, Bob MacDonald, age 27, took a .30 caliber, army type, carbine rifle and shot his wife, Betty Ann, age 24, two times--once in the back and once in the head. After killing his wife, MacDonald then turned the weapon on himself and committed suicide. The high society community the couple was a part of was mortified by the event. People wanted to know what could have possessed Bob MacDonald to do such a thing. How could this man, the son of a millionaire, a war hero, the winner of three purple Hearts, the Silver Star and the Bronze Star, and the father of two children, commit such a gruesome act? What could have possibly driven him to the type of madness where he would kill his wife and then take his own life?

In the hours following this terrible event, the couple’s parents, using their financial capital, powerful political ties, social contacts and business experience, formed a consortium of secrecy to ensure the public would never find the answer to the question of why Bob MacDonald did what he did. The families agreed to keep MacDonald’s motives for killing his wife and then himself a... Family Secret.

The shroud of secrecy, which had been in place over the intimate elements of this amazing story for over half a century, was lifted in 1996, when one of the "family insiders" made a dramatic deathbed confession to Family Secret Author, Warren R. Hull. Honoring his father’s request to tell the world the secret behind the Siegel killing, Hull provides an incredible explanation as to who murdered Benjamin Siegel, and more importantly, how and why the murder was never solved by the police!"

it could be possible, but i guess we will never know for sure.....