Teachers at a Plymouth school for vulnerable children went on strike today in a dispute with senior management.
Union bosses claim staff are being 'bullied' and not treated well enough - and have warned more walkouts could follow.
But the school, which is run by a group of trustees and outside of local authority control, says it is committed to working constructively to find a way forward.
ACE is a free school, part of an academy trust for youngsters who have been excluded from mainstream education.
Parents also joined the picket line to show their support. Mum Katy says the school turned her son's life around.
Along with claims of bullying, teachers also say they are not being treated with dignity or consulted over changes to working patterns.
Last month the CEO of the academy trust was suspended pending an investigation, but the reasons have not yet been revealed.