Conversation so far:
How many appointees acted as defendants?
In 2000, Giuliani appointed 34-year-old Russell Harding, the son of Liberal Party of New York leader and longtime Giuliani mentor Raymond Harding.
Did he appoint anyone else?
In a related matter, Richard Roberts, appointed by Giuliani as Housing Commissioner and as chairman of the Health and Hospitals Corporation, pleaded guilty to perjury.
how many defendants were there?
Giuliani was a longtime backer of Bernard Kerik, who started out as a NYPD detective driving for Giuliani's campaign.

Question: What was he on trial for?
Self-contained rewrite: What was Richard Roberts on trial for?