In 1917, Daniello eventually became an informant for the New York police and helped destroy the Camorra crime gangs in Brooklyn.

After his escape from prison in 1906 he made his way to the French port of Le Havre, from which he sailed to New York where he was smuggled in illegally.

[4] In New York, Daniello became a low-level criminal with the Brooklyn-based Navy Street gang, made up primarily of Italians from Campania and Naples in Italy, where the Camorra hailed from, and headed by Alessandro Vollero and Leopoldo Lauritano based with its nerve centre in Vollero's coffee house at 113 Navy Street.

In November 1916, Daniello participated in the ambush murders of Nicholas Morello and Charles Ubriaco on a New York Street.

In 1917, Vollero was extradited to New York and indicted in the murders of Morello, Umbracio and Manhattan gambler George Verrizano (which Daniello later claimed he had participated in).

Daniello's testimony, along with that of "Johnny the Left" Esposito, Tony Notaro, and other Navy Street and Coney Island gang members, led to Vollaro's conviction.

The conviction of Vollero and his associates marked the end of both the Navy Street Gang and the Brooklyn Camorra organization.