Anthony Joseph Accardo, also known as "Joe Batters" and "Big Tuna", was an American longtime mobster. In a criminal career that spanned eight decades, he rose from small-time hoodlum to the position of day-to-day boss of the Chicago Outfit in 1947, to ultimately becoming the power behind the throne in the Outfit by 1972. Accardo moved the Outfit into new operations and territories, significantly increasing its power and wealth during his tenure as boss.

The Chicago Outfit is an Italian-American organized crime syndicate or crime family based in Chicago, Illinois, which originated in the city's South Side in 1910. It is part of the larger Italian-American Mafia.