Final answer:
Meyer Lansky is considered the most powerful Jewish gambling boss, although Bugsy Siegel also had significant influence in the gambling industry.
Step-by-step explanation:
The most powerful Jewish gambling boss is often considered to be Meyer Lansky. Lansky was a key figure in organized crime during the mid-20th century and played a major role in the development of the national crime syndicate in the United States.
Lansky was known for his involvement in various illegal activities, including gambling. He had a major influence on the gambling industry in Las Vegas and was instrumental in the development of the Flamingo Hotel and Casino, which was opened by his associate Bugsy Siegel. While Siegel was also a prominent figure in the world of organized crime, Lansky's influence and power are often considered to be greater.
While Arnold Rothstein and Frank Costello were also influential figures in organized crime, they are not typically associated with being the most powerful Jewish gambling boss.