Conversation so far:
How many of Rudy Giuliani's appointees acted as defendants in criminal proceedings?
3 of Rudy Giuliani's appointees acted as defendants.
Did Rudy Giuliani appoint anyone other than Russell Harding?
Giuliani appointed Richard Roberts as Housing Commissioner and as chairman of the Health and Hospitals Corporation.

Question: How many defendants were there?
Self-contained rewrite: How many of Rudy Giuliani's appointees were defendants in criminal proceedings?