Jake "Greasy Thumb" Guzik (March 20, 1886 – February 21, 1956) was the financial and legal advisor, and later political "greaser," for the Chicago Outfit.
Guzik was born near Kraków, Kingdom of Galicia and Lodomeria, Austria-Hungary on March 20, 1886, to parents who were German Jews from Katowitz, in Prussian Silesia.
During the 1940s and 1950s, when the national syndicate was dominated by the Big Six, Guzik and Accardo flew east weekly to meet with the other heads of the organization: Joe Adonis, Frank Costello, Meyer Lansky and Longy Zwillman.
Guzik died of a myocardial infarction on February 21, 1956, while in bed at a South Side Chicago apartment he rented under the name Jack Arnold.
Guzik was introduced in the two-hour pilot, in which he was portrayed by Bern Hoffman, and returned in the first episode as the brains behind the Chicago Outfit after Al Capone's conviction.