NUT union members at Thorp Academy in Ryton, Gateshead, struck on Friday of last week to defend jobs and conditions.
More than 30 strikers joined a mass picket.Bosses are forcing massive cuts to their budget. More action is planned.
Over 180 people debated a proposed conversion of three schools into a multi-academy trust at a meeting in York on Thursday of last week.
It involved parents, unions and anti-academy activists. They resolved to demand the city council ballot parents and staff to give them a say.
NUT union members at Haringey sixth form school, north London, are set to strike on Wednesday and Thursday of this week over compulsory redundancies.
This follows converting to an academy last year.