[1]Gus' older brother, Sam Alex, was also associated with the Outfit, reportedly controlling the Chicago local of the Hoisting Engineers, and engaged in other racketeering activities before his suicide in 1987.

[2] Working primarily for Al Capone's Jewish-American associate, Jake Guzik, Alex would later become his protégé as he rose through the ranks of the Chicago crime family.

Described as "one of the wiliest and slickest crooks" within the Chicago Outfit,[citation needed] Alex would invoke the Fifth Amendment over 39 times during his appearance before the Permanent Subcommittee on Investigations of the U.S. Senate Committee on Government Operations in refusing to answer questions about his activities.

Remaining a high-ranking member of the Chicago Outfit for over 30 years, Alex would retain his position throughout the reigns of Felice "Paul 'The Waiter' Ricca" DeLucia, Antonino "Tony," "Joe Batters" Accardo, and Salvatore "Sam," "Mooney" Giancana.

During Outfit leader Joseph "Joey Doves" Aiuppa's imprisonment, Alex would share responsibility for overseeing day-to-day activities with underboss Samuel "Wings" Carlisi.

[3] Sentenced to fifteen years and eight months' imprisonment and a $823,000 fine in February 1993, he died of a heart attack in federal prison at Lexington, Kentucky, aged eighty-two on July 24, 1998.