If your teenager comes home from school on Wednesday asking why their teacher was wearing a black armband, you can tell them it's because of the McGuinty Liberals.

Public high school teachers will not take part in extra-curricular activities for the day, and they'll be wearing black in protest of the bill that was passed at Queen's Park on Tuesday, which imposes a two-year wage freeze on teachers, among other items.

The Elementary Teachers Federation of Ontario union boss, Sam Hammond is urging his 76,000 members to stop taking part in all school-based or system level meetings of any kind on Mondays for the foreseeable future. He's calling it simply "McGuinty Mondays"

"We do not take this action lightly. Ontarians and the government need to know that you cannot take away the democratic rights of working people simply to fulfill a political party’s agenda or ideology," said Hammond.

Unions have called the "Putting Students First Act"unconstitutional and vow to fight it all the way up to the Supreme court of Canada.