Bhushan - did you know about instaban? If you go to to a user's profile and look at the drop-down, there's instaban there. It's only eligible for people with over 3,000 karma, which you have!
We're investigating a possible bug that it might not work - https://jira.atlassian.com/browse/ANSWERS-1119. I'm about to go look into that.
I think a lot is already done on this. See the following threads.
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