Jehovah's witnesses

The JWs have a long history of church discipline. For them its absolutely core. So there are a lot of resources about their discipline..

• Letter indicating the legal status of disfellowshipping
• Watchtower information's page of disfellowshipping news (another blog)
• Disfellowshipped.org a website dedicated to people's stories
• Wikipedia article
• Watchtower article / apologetic
  

One thing that is key is that because the law on disciplining non members is questionable they have created a class called "disassociation" (someone who has severed ties) and they distinguish this from "disfellowship" which is disciplinary. Shunning occurs regardless but the idea of disciplining a non member is thus avoided.