In 1921, like Petrosino had before him, Fiaschetti traveled to Naples in pursuit of a camorrista fugitive and, while in the Neapolitan underworld, attempt to gain information on the individual who had ordered Petrosino's death.
During his career, Fiaschetti frequently dealt with the Black Hand as well as other organized crime figures and criminals in New York's Little Italy and throughout the city such as the Black hand kidnap-murder of five-year-old Giuseppe Varotta on May 21, 1921 .