Forum "Rebels" - admins, you are invited to interact in this topic

[TECK]

Hi guys,

There are many forum admins among us, some that start a new community, others that are on the vBulletin scene for years, with thousands of members and millions of posts.

I would like get get some feedback from all of you, regarding delicate situations that occur in all our boards. I'm talking about communication between forum members.
I noticed that, in certain forums, there are 2 types of member groups, the ones that try to help and make themselves useful to the community, and others who like to criticize, laugh, insult and disobey to forum regulations.

You are forum admin and you notice this phenomenon:
Few members try to create a "mini" society of "rebels", that try to pick always on the weak ones who are not as "skilled verbally" as they are. They get, slowly-slowly, other adepts also, since there are few others that would like to be "cool" and laugh at other members and make them look like idiots.

If you have a situation like this on hand, how would you handle it?
What administrative measures would you take for your forums and what type of forum rules should be placed in order to control this behaviour?

Feel free to comment why and how you will take your decision or exchange ideas, your comments will help other forum admins.

Thanks for your input.