In reply to your previous question I tried to provide a link to the official definition of 'moral turpitude', as used by US immigration staff. On checking back on that post I now see that my link failed to work. Here's another attempt:
http://tinyurl.com/3afsm8g
As far as I can tell 'harassment' probably isn't classed as 'moral turpitude' (The USA's rules seem rather strange to most Brits. Nicking a Mars bar is classed as 'moral turpitude'. Assaulting someone, leaving him injured and unconscious, usually isn't!).
My recommendation would be to simply keep quiet about your conviction but please don't blame me (or anyone else here on AB) if that advice turns out to be flawed.
Chris