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.
More top news
Prince William and Kate have announced they are to become 'full-time' Royals as they move their family back to London from Norfolk.
Jobs for Americans, a strengthened military, new trade deals and support for police will shape Donald Trump's four years in government.
Donald Trump pledged to put "America first" as he addressed the nation after being sworn in as the 45th president of the United States.