Ducksoup, I totally agree, I wouldn't take on someone willingly breaking a contract either.
I merely mentioned that this comment had been made. In fact anyone at the BALPA employment conference where he spoke would have heard that comment, it was said publicly. I was just mentioning it in the context of what we were talking about.
As for "blacklists" of people not to employ, unfortunately these things are generally not in writing.
I only found out about my bad reference because someone who had interviewed me had heard the comments and could not believe they were true, and wanted to let me know that this was being said about me.
So there are still some gentlemen out there.