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.

Question: how many defendants were there?
Self-contained rewrite: how many defendants were there for Richard Roberts?