NASUWT General secretary Chris Keates told a fringe meeting at the Labour party conference in Manchester that the industrial action involved areas which "burdened" teachers.
We are sending a strong message to the Government, and we need Labour to stand alongside us. We cannot stand by and allow this Government to wreck education.
Ms Keates said what was happening in education was similar to the "privatisation" of the NHS.
We don't want privateers and marketeers in schools. We have a fight on our hands - and we cannot wait until 2015.