A teaching union calling for new laws to stop members of racist groups becoming teachers has admitted it has a Midland BNP activist in its ranks.
The National Association of Schoolmasters & Union of Women Teachers yesterday urged Ministers to protect children from the "vile agenda" of political parties such as the BNP, the National Front and Combat 18.
But the union has been unable to get rid of Simon Smith who stood as a BNP candidate for Warley in the election and who until last year taught at a Solihull school.
General secretary Chris Keates said: "He regrettably remains in membership of the NASUWT. We are currently pursuing legal advice on how to remove him from membership and we wrote to him when his activities first came to light asking him to resign from membership but we have had no response to that."
Ms Keates blamed " antitrade union legislation" brought in by the Conservative Government for making it difficult to remove members with contradictory views.
The NASUWT claims there is growing evidence that organisations like the BNP were exploiting the loophole to infiltrate trade unions other public organisations.
"It is a common strategy for groups of this type to join unions and then almost tempt them to throw them out knowing that the legislation could result in them successfully claiming unfair discipline and receiving compensation," said Ms Keates.
Supply teacher Mr Smith was forced to leave a temporary post teaching maths at St Peter's Catholic School in Solihull after his BNP connections were exposed.
He now spends his time campaigning for the party.
Ms Keates has written to Education Secretary Ruth Kelly asking her to introduce amendments to teachers' terms and conditions barring people like Mr Smith.
The union pointed out that such restrictions already exist for those employed in the police force, probation and prison services.
Ms Keates added: "Those who support racist and fascist agendas have no place in the teaching profession."
A spokesman for the Department for Education and Skills said: "This is an interesting proposal which we will discuss further with NASUWT and the rest of the teaching profession."
But BNP regional organiser Simon Darby attacked the move. "You have to give people the choice to believe in whatever political organisation they want," he said.