User blog comment:Meighan/Wiki Wisdom: Reacting to Trolls and Vandalism/@comment-25129106-20111218130255/@comment-1903155-20111218140809

Block the people. If they're similar IPs, use a range block for about a month. If they're single IPs, try 2 - 6 weeks, if they're users, block them 6 months - 1 year.