Although ETFO claimed that teachers can choose whether to take part in extracurriculars, the labour relations board found that the removal of a service when a collective agreement is in place constitutes a strike action.
The board released its decision Thursday but made no orders because the union's Charter challenge — about whether a government can decide to remove unionized workers' right to strike and impose a contract is acceptable or not — has yet to be heard in court.
ETFO has also asked the labour relations board to rule on the definition of a strike under controversial Bill 115, the Putting Students First Act.
Education Minister Liz Sandals released a statement saying that the ministry is currently reviewing it.
But she said the governing Liberals "continue to be focused on rebuilding relationships."
To read the labour relations board's full decision on withdrawing extracurriculars, look below.