Punishing those who leave - disfellowshipping

[PeteWaldo]

Like Jehovah's Witnesses the Christadelphians engage in the practice of disfellowshipping

"The Christadelphian form of excommunication is called “disfellowshipping” or “withdrawal of fellowship.”  It is the disciplinary method which occurs when people do not follow church authority on matters of belief or practice."
http://christadelphianresearch.com/disfellowshipping.htm