How to ban a spammer with 100’s of gmail accounts?

Professor Quack: How to ban a spammer with 100’s of gmail accounts?
There’s an option for area ban, how to do this ?
Ban him from using Google Group forum

Answers and Views:

Answer by G
You can start by setting up spam_filters for certain messages TO, CC, From, etc…message headers to avoid most of spammer mass mailing dictionary trix; as well as checking the Report_Spam Box before deleting the messages to help the Googler Team with thier research on these INet menaces. You can also have your Gmail spam folder dump at set intervals. See; Help + Settings.

You could also report him to Google 650-253-0000