[1] While council for Dr. Charles H. Parkhurst, Moss helped police in closing down gambling dens belonging to the On Leong Tong in Chinatown.

Much of the information was supplied by Mock Duck, a rival underworld figure of Tom Lee and the On Leongs, and who quickly assumed control of these establishments after they were closed.

While cross-examining Tammany Hall leader Richard Croker during the Mazet inquiry, Moss was able to provoke him into stating the now famous statement admitting his corruption: "I am working for my pocket all the time, just like you, Mr.

In 1901, during Seth Low and William Travers Jerome's campaign against the city's red light districts, Moss famously addressed the court in a speech blaming Croker for the existence of white slavery and forced prostitution.

It was partly on evidence gained at this trial that he was able to greatly assist Whitman in proving that police detective Charles Becker hired the four gunmen to kill Rosenthal resulting in his conviction and execution.