Frank Costello Net Worth — How Rich Was the Prime Minister of the Underworld?

Frank Costello was the most politically connected figure in the history of the American Mafia. While other bosses ran their empires through violence and intimidation, Costello preferred a different currency: influence. His network of corrupt politicians, judges, police officials and Tammany Hall figures gave him protection and access that money alone could never buy. He was, in the truest sense, the Mafia’s diplomat — and he became very rich at it.

Frank Costello Net Worth — The Numbers

How Did Frank Costello Make His Money?

Slot machines. Costello’s most reliable and distinctive revenue stream was slot machines. In the 1930s and 1940s he operated thousands of slot machines across New York and Louisiana, having been granted permission to operate in Louisiana through his political connections to Governor Huey Long’s circle. The operation generated millions annually.

Political corruption. Costello’s greatest asset was his extraordinary network of corrupt politicians and officials. Through Tammany Hall he effectively controlled the Democratic Party machinery in Manhattan for years, placing judges on benches and police officers in positions that protected his operations. The financial return on this investment was enormous.

Gambling operations. Like all major Mafia bosses of his era, Costello ran extensive illegal gambling operations — bookmaking, numbers games and casino-style establishments across New York.

Bootlegging. Costello made his early fortune through bootlegging during Prohibition, working alongside Lucky Luciano and others to control alcohol distribution across New York.

Legal Troubles and Conviction

Costello was convicted of tax evasion in 1954 and served eleven months. His most dramatic legal moment came during the Kefauver Committee hearings in 1951, where his televised testimony — with cameras trained on his hands because he refused to allow his face to be shown — captivated the American public and effectively ended his political influence. He survived an assassination attempt by Vincent Gigante in 1957, and chose not to retaliate — a decision that was both wise and in keeping with his non-violent philosophy.

What Happened to the Money?

Costello retired from active Mafia leadership following the 1957 assassination attempt, ceding formal authority to Vito Genovese. He lived out his remaining years in Manhattan, maintaining a comfortable lifestyle. He died of a heart attack on February 18, 1973, at the age of 81 — one of the very few major Mafia bosses of his era to die peacefully of natural causes.

How Much Would Frank Costello Be Worth Today?

$600 Million in today’s money — adjusted from $50 Million at peak. The precise figure depends on the inflation methodology used, but all estimates place Frank firmly among the wealthiest figures in the history of American organised crime.

Frequently Asked Questions — Frank Costello Net Worth

What was Frank Costello’s net worth?

Frank Costello’s peak net worth is estimated at approximately $50 million — equivalent to around $600 million today. He built his wealth primarily through slot machine operations, political corruption networks and gambling.

How did Frank Costello make his money?

Through slot machine operations across New York and Louisiana, bootlegging during Prohibition, illegal gambling, and his extraordinary network of corrupt political and law enforcement contacts that protected and enabled his operations.

Why was Frank Costello called the Prime Minister of the Underworld?

Costello earned the nickname through his preference for diplomacy and political influence over violence. He was the Mafia’s primary liaison with the political establishment, controlling Tammany Hall patronage and placing allies at every level of New York government.

Was Frank Costello ever convicted?

Yes — Costello was convicted of tax evasion in 1954 and served eleven months. He also faced contempt charges from the Kefauver hearings. Compared to most of his contemporaries his legal troubles were relatively minor.

How much would Frank Costello be worth today?

Costello’s estimated peak net worth of $50 million in 1950s dollars is equivalent to approximately $600 million today.