Young Marcello turned to petty crime in the French Quarter. He was later imprisoned for masterminding a crew of teenage gangsters who carried out armed robberies in the small towns surrounding New Orleans. At the time, local newspapers compared him to the character of Fagin from Charles Dickens' novel "Oliver Twist". This conviction was later overturned. However, the following year he was convicted of assault and robbery and was sentenced to the Louisiana State Penitentiary in West Feliciana Parish for nine years. He was released after five years.