Teachers in the NUT union at Norlington School, east London, are continuing their fight after three days of strike action.
They are trying to stop the school being turned into a privately-run Trust school sponsored by the Institute of Education.
Last week school governors voted for the plan despite a lobby against it. The NUT has pledged to continue the campaign.
A staffing crisis in the NHS
Health workers set to strike across four Manchester hospitals
Bus workers rejected an offer and came back out