Israeli law enforcement officials say they want to question Lev Leviev, the business baron whose companies allegedly are at the center of a vast diamond-smuggling ring that has operated for years.

Though a hero to the Chabad ultra-Orthodox movement to which he belongs, including for his expansive philanthropic endeavors, Leviev has been criticized, and his businesses boycotted, over construction projects in West Bank settlements. He has also been dogged by accusations of abuse at gem mines in Angola.