The Italian-American National Union (formerly known as Unione Siciliana) was a Sicilian-American organization, which controlled much of the Italian vote within the United States during the early twentieth century. It was based in Chicago, Illinois. It was a major source of conflict during Prohibition, as underworld figures fought to control the highly influential organization through a series of puppet presidents largely controlled by the Chicago Outfit. During the 1970s, the organization was probably merged into the Italian Sons and Daughters of America. However, similar groups still exist and have much influence in Italian American communities throughout the United States.