The part-time role has been held jointly by George Robinson and Barbara Maines, of Lucky Duck Publishing, both advocates of the "no-blame" approach, which favours non-punitive methods.
The alliance says it is not appropriate for anyone publicly associated with a single anti-bullying strategy to take up a role as a regional co-ordinator.
The decision was announced on 6 February, when Robinson and Maines resigned their membership after being told their contract would not be renewed.
"We have witnessed an indefensible level of bullying, manipulation and intervention, directed towards an independent organisation," said Maines.
Simon Blake, manager of the Anti-Bullying Alliance at the National Children's Bureau, said: "The alliance does back the support group approach as part of a range of approaches. We're trying to make sure there's no public association (of our work) with one particular approach."
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