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
A 16-year-old boy has been arrested on suspicion of terror offences as he prepared to leave the UK.
An man is reported to have wounded at least five people - two seriously - in an attack in the Swiss town of Schaffhausen.
Donald Trump's son-in-law has denied any improper conduct during four contacts with Russians during and after the presidential election.