The Chicago Teachers Union is encouraging Chicago Public School teachers to “take action” against the school district, but the union’s agenda risks teachers’ jobs without backing by science or law.

CTU members who don’t support the union’s violent rhetoric have another option: they can opt out of the union. But they must do so today if they want to stop paying dues this school year.

While members can opt out of CTU at any time, the union says they may only stop paying the union if they do so during a one-month period. A lawsuit filed against the union argues this violates teachers’ First Amendment rights.