"There are no more professional criminals in this business."

I'm sure a professional criminal could have done it, but not many others.

The professional criminal did not practice his profession to get rich.

Some time later, she escaped and became a professional criminal.

Should we send such people to prison, so that they can learn how to become professional criminals?

Thus far, he had thought of these nameless men as professional criminals.

About 35 of these have been professional criminals, he said, including 2 active-duty and 20 former police officers.

On the other hand, the professional criminals might be easier for us to deal with in one respect at least.

He said, "What we are proposing to do is to take a large sum of money away from professional criminals."

It is also easy for professional criminals to avoid getting caught in the net.