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.
How many of Rudy Giuliani's appointees were defendants in criminal proceedings?
Three of Giuliani's appointees were defendants in criminal proceedings.

Question: What was he on trial for?
Self-contained rewrite: What was Russell Harding on trial for?